Toluidine blue stain preparation

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preparation of botanical sections stained with toluidine blue 0. Animal histologists have long rec-ognized the usefulness of this stain-ing agent, which has the remarkable property of giving different colors to different tissue components (polychromasy). O'Brien, Feder, and McCully (1964) describe simple methods of utilizing toluidine blue 0.04g Toluidine Blue 100ml 0.1M sodium acetate buffer (pH 3.75-4.25

Toluidine Blue Staining - Staining Protocol - LabCE

  1. Toluidine Blue Staining Is Superior To H E For Ihc World Toluidine Blue Staining Is Superior To H E For The Identification Of Ganglion Cells In Frozen Rectal Biopsies Histological Techniques Tissue Preparation Toluidine Blue Staining Of Resin Embedded Sections For Evaluation Peripheral Nerve Morphology Protoco
  2. APPLICATION OF TOLUIDINE BLUE Connective tissue mucins, especially acid mucins. The tissue stains purple to red, while thebackground is stained blue
  3. To evaluate tissue preservation and orientation, stain the first slide of each set with toluidine blue (1%-2% w/v in H 2 O), hematoxylin, and eosin, or any aqueous stain. 5. Immediately immerse the slide into an appropriate fixative (see Fixation and Permeabilization of Cells and Tissues [ Fischer et al. 2008a ] for guidelines on choosing an.

DNA stains dark blue with toluidine blue stain so you should be able to see blue groups of chromosomes against a paler background. 9 If your preparation is not very successful, repeat with some of the other root tips from step 3. Try to adjust your procedure to remedy the problem; for example, if your cells are over- or under-stained, adjust. Toluidine Blue Stain * Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map

Toluidine Blue Staining in Microbiology: Procedure, Uses

GTAC Staining Plant Stem Sections Page 5 of 6 Preparation and procedural notes Suppliers of stains Stain Supplier and product Cost in 2015 Toluidine Blue, 0.05% solution (dilute to 0.02‐0.025% in dH2O for stem staining procedure) Southern Biological SI18 ‐ Toluidine blue, 0.05% available in 100mL & Nuclear staining is performed with toluidine blue, counterstaining with eosin. The preparations can be covered in the usual way and are permanent Tissue Preparation: Staining Methods. The information on histology stains is provided as a resource to be used throughout the first two years of medical school. For the Foundations module, you should be understand H&E staining, toluidine blue staining, Periodic-Acid-Schiff (PAS) staining, Giemsa, and trichrome staining Toluidine blue is an acidophilus metachromatic nuclear stain that colors sites of squamous cell carcinoma, but not adjacent normal mucosal surfaces. Whether or not Toluidine blue actually stains tumor nuclei is still not proven, but dye may diffuse into larger intercellular canaliculi present in the tumor cells Toluidine blue stock solution -------------- 5 ml 1% Sodium chloride, pH 2.3 --------------- 45 ml Mix well. The pH should be around 2.3 and less than 2.5 Make this solution fresh and discard after use. pH higher than 2.5 will make staining less contrast

2. Working Toluidene blue, 1-2 minutes. 3. Rinse in distilled water, 3 changes. 4. Deydrate quickly through the 95% and absolute alcohols. 5. Clear in xylene and coverslip. RESULTS: Mast cells violet Background shades of blue Toluidine Blue Stock Solution: Toluidine Blue O 1.0 gm 70% alcohol 100.0 ml Mix, solution is stable for 6 months What is Toluidine Blue? Toluidine blue (TB) is a polychromatic dye which can absorb different colours depending on how it binds chemically with various tissue components. It first emerged in 1856, courtesy of a British chemist called William Henry Perkin. Although he was working on the synthesis of quinine, Perkin instead produced a blue substance with good dyeing properties Newcomer Supply Toluidine Blue Stain for Mohs Technique provides a rapid staining method for Mohs micrographic surgery (MMS), useful when evaluating frozen skin samples for basal cell carcinoma (BCC)

4 Add 2 drops of aceto‐orcein stain (or Toluidine blue stain) to the root tips. Sit for 1min to allow the stain to penetrate the tissue. (you may need to remove excess HCl or transfer the root tips to a new slide) 5 Place a coverslip over the roots. Fold a small piece o Toluidine blue is also commonly used to stain frozen sections (rapid microscopic analysis of a specimen). Because time is of the essence for a frozen section, toluidine blue allows for the frozen section to be stained and reviewed in 10-20 seconds. The other staining method for frozen sections (rapid H&E) takes approximately 60 to 90 seconds Thin Film Preparation. Requirements A prick needle; A clean glass slide (2 or 3) Stain (toluidine blue, methyl violet or methylene blue) - either stain can be used; Cotton swab and alcohol; Procedure Using a cotton swab with alcohol, clean the tip of the middle or ring finger and prick with a clean pricking needl 14950. 100503-882EA 39.3 USD. 100503-882. Toluidine blue - Basic fuchsin solution Epoxy Tissue Stain. Toluidine blue - Basic fuchsin solution. A toluidine blue and basic fuchsin preparation; ready to use. For staining semi-thin sections of epoxy embedded tissues. Spurlock, B.O., (1966) et al., Am. J. of Clin. Path

Toluidine Blue O (TBO) is a thiazine dye of the quinone-imine family and is cationic in nature. It has been employed in polychromatic staining of paraffin embedded plant cell walls. It is a metachromatic dye suitable for a wide variety of histological staining procedures Toluidine blue is a basic thiazine metachromatic dye with high affinity for acidic tissue components.. It stains nucleic acids blue and polysaccharides purple and also increases the sharpness of histology slide images. It is especially useful today for staining chromosomes in plant or animal tissues, as a replacement for Aceto-orcein stain.. Result

Toluidine Blue Stain - an overview ScienceDirect Topic

Toluidine Blue Staining Protocol for Mast Cell

The toluidine blue (C.I. 52040; Wako Pure Chemical Industries, Ltd) solution was also prepared as a 0.05% solution in 5% EtOH. Toluidine blue staining was performed according to the same protocol used for our staining method. Staining procedures for the standard staining protocol. The standard staining protocol consists of three steps, as follows INTRODUCTION. Toluidine blue (also known as tolonium chloride) is an acidophilic metachromatic dye that selectively stains acidic tissue components (sulfates, carboxylates, and phosphate radicals).[] Toluidine blue (TB) has an affinity for nucleic acids, and therefore binds to nuclear material of tissues with a high DNA and RNA content.[] It is a member of the thiazine group and is partially. Toluidine Blue (CI 52040) 0.02 g. *. METHOD. *1 Dewax and rehydrate sections. 2 Transfer sections to potassium permanganate solution for 2 minutes. 3 Rinse in distilled water. 4 Transfer sections to potassium metabisulphite solution for 1 minute (or. until sections appear white). 5 Wash in tap water for 3 minutes Thin sections, 1-2.5 μm, were cut and mounted on glass slides. The sections were either treated with RNase or not, then stained with 0.1% toluidine blue O and observed through ∞/0 objective lenses. For light microscopy, the enzyme staining procedure increased resolution and contrast

Toluidine Blue: A Simple, Effective Stain for Plant Tissue

18.1.2 Chemical Properties of Toluidine Blue Dye. Toluidine or tolonium chloride dye is a member of the thiazine group and was discovered by William Henry Perkin in 1856. This metachromatic dye selectively stains acidic components such as sulfates, carboxylates, and phosphate in cells or tissues Toluidine blue stain Toluidine blue is a basic thiazine metachromatic dye that stains nuclei blue, and can be used to differentiate different types of granules (e.g. within mast cells). SouravBio in Staining Apr 6 · 1 min read >

Toluidine Blue staining SYBI

toluidine blue O because the stain gives better definition of chromosome structure. Using a vial for staining reduces the risk of spillage. A common mistake is that students mix up the tip and the non-dividing end of the root. Heating with a mixture of acetic orcein stain and HCl is a potential hazard and careful check Toluidine Blue O (TBO) is a thiazine dye of the quinone-imine family and is cationic in nature. It has been employed in polychromatic staining of paraffin embedded plant cell walls. TBO can be removed from its aqueous solution by using an effective adsorbent, clinoptilolite. TBO and fixed output laboratory laser light source are used together.

Toluidine Blue Stain Recipe Deporecipe

A biological stain composition contains toluidine blue O and a pharmaceutically acceptable oxidizing agent to convert any leuco toluidine blue O to the chromo form. A dry composition for preparing the stain includes the toluidine blue O, the oxidizing agent and an effervescent agent. These compositions are preferably buffered to improve shelf stability and clinical consistency Toluidine blue. Sometimes referred to as tolonium chloride, toluidine blue is a type of metachromatic dye, that is acidophilic, meaning that it stains acidic tissues. It is particularly attracted to nucleic acids, and is therefore used to stain tissues with high concentrations of DNA and RNA. When in contact with Toluidine Blue, nucleic acids. Thereafter toluidine blue 0 was reported as an in vivo stain for delineation of oral intraepithileal neoplastic changes (Niebel, et al., J. Am. Dent. Assoc. 68:801 1964). Subsequently over two dozen publications have demonstrated the utility of toluidine blue 0 as an in situ stain for the detection and aid in the diagnosis of oral carcinomas tensity of toluidine blue staining, and malignancies stain dark or royal blue, areas such as the dorsum ofthe tongue, buccal mucosa with surface debris and/or keratin, gingival crevices, and posterior soft palate may occasionally stain pale blue to dark blue due to mechanical surface adherence rather than nuclear affinity Tolonium Chloride. Toluidine blue is a blue cationic (basic) dye used in histology for staining semithin (0.5-1μm) sections of resin-embedded tissue and in desorption assays for the determination of the number of negatively charged surface groups on polymer beads (Hennig et al., 2012). From: Comprehensive Biomedical Physics, 2014

Cryosectioning Tissues - CSH Protocol

Special Stain, Toluidine Blue ARUP Laboratories Test

To stain, float the cross sections in water, then add a drop or two of Toluidine Blue, let sit for about a minute, then wash clean with water applied to one side and absorbed by a paper towel or Kimwipe on the other. If available, place a cover slip over the material. Caution: Toluidine Blue will stain skin and clothes, you ma a slide, drying the smear, and then staining with toluidine blue and eosin. This preparation is intended primarily to show the proximal portions of the dendrites and axons of these multipolar nerve cells as well as the Nissl substance. In most instances, the axon has been broken off. The motor neurons are the largest cells in the smear Trypan blue is an azo dye, derived from toluidine. It is also known as diamine blue and Niagara blue. It is widely used as a vital stain to distinguish the viable cells from the non-viable cells. It selectively stains the dead tissues or cells blue in colour. Live cells or tissues, with intact cell

Permanent Staining of Rapid Frozen Section with Toluidine Blu

specimens by the surgeon, and histopathologic preparation including routine stain(s) (e.g., hematoxylin and eosin, toluidine blue), of the trunk, arms, or legs; each additional stage after the first stage, up to 5 tissue blocks (list separately in addition to code for primary procedure). • • CPT Code +17315 This is an improved and simplified protocol from the well-known version using acetic orcein. Toluidine blue is used to stain the DNA in the meristem cells, giving a simpler and less hazardous process for the students, and producing an excellent level of contrast within the cells (see image above) Stains (toluidine blue to stain cellulose in cell walls, Methyl Blue to stain nuclei, or other prepared following manufacturer recommendations) Small Petri dish or well to hold stain and leaf section. Microscope slides. Gloves. Water dropper bottle. Slide cover glasses. Brightfield compound microscope. Microscope camera or cell phon

Histological Techniques: Tissue Preparatio

Histological staining 1. H&E staining 2. Trichrome Masson staining 3. Sirius red staining 4. Verhoeff's Van Gieson staining 5. Safranin O / Fast green staining 6. Nissl's, Mast cells staining 7. Toluidine blue staining 8. Alcian blue staining 9. PAS staining 10. AB-PAS staining 11. Luxol fast blue staining 12. Prussian blue staining 13. Oil red. A stain composed of aniline blue, acid fuchsin, and orange G. It is a good stain to use for distinguishing cellular from extracellular components. Collagen fibers stain an intense blue. Mucus and ground substance take on varying shades of blue. Cytoplasm and neuroglia stain red. Elastic fibrils, red blood cells and nucleoli stain pink or yellow Lactophenol Cotton Blue (LPCB) Staining method works on the principle of aiding the identification of the fungal cell walls. Fungi are eukaryotic organisms with both macroscopic and microscopic characteristics. The fungal spore cell wall is made up of chitin of which the components of the Lactophenol Cotton Blue solution stains for identification

Objectives: One percent toluidine blue being the most effective adjunct is often used to detect dysplasia. Not much attention has been given to the effect of toluidine blue in enhancement of cytological smears. The present study assessed the smears before and after application of toluidine blue in smokers against non-smokers using three different stains [Papanicolaou (PAP), Hematoxylin and. Histology is the preparation of biological tissue specimens which allows for microscopic examination of tissue structure and cells. Histology is used to gather research data and is an integral part of many scientific investigation processes. Mast Cell Stain Toluidine Blue Metachromasia is a phenomenon not infrequently encountered in dye staining. It is often seen following staining with a solution of a simple blue dye such as methylene blue or toluidine blue, particularly if the preparation is examined mounted with water, although those dyes are not the only ones that give this effect 2. Stain in toluidine blue solution. 1) For plant tissue slides, stain in toluidine blue solution for 2-5 min, wash in tap water. Observe by microscopy to check the staining extent. If necessary, differentiate properly according to the staining extent, wash in tap water. Dry slides in oven

Toluidine blue O (C.I. 52040) is a CERTISTAIN™ dry dye that is used for the preparation of a staining solution for staining nuclei and for visualization of metachromasia in histological sections of human origin. CAS 92-31-9, pH 2.8 (H 2 O, 25° Cover the smear with the toluidine blue-0 stain for 3 minutes. Wash off with water. Rapidly decolorize with 95% v/v ethanol. Wash with water. Allow the smear to air dry. Add a drop of oil to the smears and cover with a cover glass. Examine with the 10x and 40x objectives. Note: In the method of Gosey et al, the smear is dehydrated in 95% v/v. Keywords: cell wall-degrading enzyme, embedding, fluorescence, immunodetection, microscopy, polysaccharide, sectioning, toluidine blue. Citation: Verhertbruggen Y, Walker JL, Guillon F and Scheller HV (2017) A Comparative Study of Sample Preparation for Staining and Immunodetection of Plant Cell Walls by Light Microscopy. Front

Preparation of the stain: Great care is needed in the mixing of the 1% toluidine blue solution. There are a number of variations on the protocol, but the following is our suggestion, at least for a starting point: Saturate with sodium borate (Na 2 B 4 O 7 •10H 2 O) using 25g in 500 ml water; Allow to sit for 24 hours at 4° C (39° F Toluidine blue staining. This method is used for staining of mast cells that are found in the connective tissue and their cytoplasm contains granules composed of heparin and histamine. Following Toluidine staining, mast cells are stained red-purple and the background is stained blue

Prussian Blue (for iron) Picosirius red (for collagen I and III fibers) Toluidine blue (for mast cells) Safranin O (for cartilage) Oil red O (for lipids) Alcian blue (for mucins) Verhoeff-Van Gieson (for elastic fibers) Ask for availability of others! Level II Special Stains to Elucidate Specific Cellular Characteristics. Silver Stains examination of specimens by the surgeon, and histopathologic preparation including routine stain(s) (e.g., hematoxylin and eosin, toluidine blue), each additional block after the first 5 tissue blocks, any stage (list separately in addition to code for primary procedure). The Identified Coding Problem This allows the Pneumocystis carinii cysts to be visualized more easily after staining with Toluidine Blue 0. Diagnosis of Pneumocystis carinii pneumonia can frequently be made on bronchoalveolar lavage (BAL) or on touch preparations of pulmonary tissue (open lung biopsies and transbronchial biopsies) 7. Stain in Victoria Blue Stain, Alcoholic for a minimum of 4 hours. a. See Procedure Note #2. 8. Differentiate in 70% ethyl alcohol for 1-3 minutes or until background is completely decolorized. 9. Wash slides well in running tap water. 10. Counterstain in Nuclear Fast Red Stain, Kernechtrot (1255) for 5 minutes. 11 Recommended use This product is a laboratory preparation for educational use only. The concentrated Toluidine blue O solution should be diluted with an equal volume of distilled or deionised water before use. This diluted solution should be used for staining nucleic acids in electrophoresis gels as describe

Albert stain I have two dyes 'Toluidine blue O' and 'Malachite green' both of which are basic dyes with high affinity for neutral tissue components like cytoplasm and the pH of Albert stain I is adjusted to 2.8 by using 'Glacial acetic acid', which is acidic for cytoplasm (as it is neutral) but basic for volutin granules (as the pH. Remove slides and wipe them with a kimwipe. Also note that absolute color intensity on H&E-stained slides can be quite variable, with the same cell structure appearing red on one slide, pink on another, and possibly even blue on yet another. Fluorescence microscopy of live cells uses either genetically encoded fluorescent proteins (e.g. Tissue sections are then rehydrated prior to commencing.

Preparing toluidine blue stain: Hazcard 32 describes this as low hazard. Dissolve 0.5 g of solid toluidine blue in 100 cm 3 of water. Using toluidine blue stain: Place a small piece (2-3 mm) of the tissue to be stained on a clean slide. Place three drops of 1.0 M hydrochloric acid on the tissue. Warm the slide very gently in a small Bunsen. 1. Toluidine blue stain can be purchased in powder form from suppliers such as Philip Harris Education [tel: 01543 480077, fax: 01543 480068]. Make up a 0.5% solution in McIlvaine buffer [0.1M citric acid, 0.2M sodium hydrogen phosphate at pH4]. This should keep for many months at room temperature. 2 Stain in Mayer's hematoxylin for 5 minutes Wash in water until blue Proceed with required staining technique Preparation of Solution Hematoxylin 1 g Distilled water 1000 ml Potassium or ammonium alum 50 g Sodium iodate 0.2 g Citric acid 1 g Chloral hydrate SLR 50 g Chloral hydrate AR 30 Toluidine Blue Staining of Resin-Embedded Sections for Evaluation of Peripheral Nerve Morphology Article doi: 10.3791/58031. July 3rd, 2018 • Adel B. Ghnenis 1, Richard E. Czaikowski 1, Zhaojie J. Zhang 2, Jared S. Bushman 1. 1 School.

Toluidine Blue Stain Recipe | Deporecipe

Violet color in Toluidine blue staining; Gamma type - color is fully metachromatic due to completely polymerized surface bound dyes (Eg red color in Toluidine blue staining) Preparation of stain - Mix them and add 5ml of 1% of potassium permanganate for ripening Isotonic 0.1% toluidine blue is recommended because it stains lymphocytes and the nuclei of pus cells blue. C. neoformans yeast cells stain pink. Red cells remain unstained. The motility of trypanosomes is not affected by the dye. 3. When toluidine blue is unavailable, isotonic methylene blue can be used which will also stain the nuclei of. Synthesis of Toluidine Blue 0 and Toluidine Blue 0 Zinc Chloride Double Salt: • Set the LFE controller Set Point to 7.0. Once the reaction mixture temperature reaches 10.0°C ± 3°C add potassium dichromate solution (6532.4 g ± 32.0 g) over a 20 minute period (± 5 minutes). When addition is complete stir 20 minutes PROCEDURE: Specimens were taken from lesions and slides prepared, using 3 techniques: touch impression, medium-pressure impression, or smear preparation. Preparations were then stained with 4 stains: modified Wright stain, May-Grünwald-Giemsa, toluidine blue, and zynostain and examined in a blinded randomized fashion

7. Add 2 drops of 0.5% toluidine blue to stain the root tip in the tube. Incubate at room temperature for 5 minutes, gently flicking the tube with the flat of your fingernail about once a minute to distribute the stain. Make sure the root tip stays in the stain. 8 STAINING OF VOLUTIN-CONTAINING ORGANISMS Well developed granules of volutin (polyphosphate) may be seen in unstained wet preparation as round refractile bodies within the bacterial cytoplasm. PRINCIPLE: With basic dyes they tend to stain more strongly than the rest of the bacterium, and with toluidine blue or methylene blue they stain. Toluidine blue is also commonly used to stain frozen sections (rapid microscopic analysis of a specimen). Because time is of the essence for a frozen section, toluidine blue allows for the frozen section to be stained and reviewed in 10-20 seconds. [2] The other staining method for frozen sections (rapid H&E) takes approximately 60 to 90 seconds Toluidine blue c. Methylene blue d. Eosin e. Thionine. 5. Which of the following would be best suited for peripheral blood smears? a. Wright's stain b. Hematoxylin and eosin stain c. Sudan stain d. Silver impregnation e. Masson's trichrome stain. 6. Which of the following stains is used for routine histological examination? a. Wright's stain b.

The choice of stain depends on the sample and diagnostic possibilities. Giemsa stain. Giemsa stain is poured over the slide. After 15 minutes, the slide is washed with sterile water. Cell cytoplasm stains blue; Nuclei stain purple/red/pinkish; Toluidine blue. Toluidine blue is more rapid than Giemsa, as it only requires staining for 60 seconds. The pH of Albert stain is adjusted to 2.8 by using acetic acid which becomes basic for volutin granules as the pH of volutin granule is highly acidic. Therefore on applying Albert's stain to the smear, toluidine blue' O' stains volutin granules i. e the most acidic part of cell and malachite green stains the cytoplasm blue-green Thick** sections (0.5µm) & Toluidine Blue Staining/Block: $50.00; Thin sections (85-90nm) & Uranyl Acetate Staining/Block: $75.00 **Thick sections are required for all projects. The slide is a reference to quality and orientation of specimens. Images sent to researcher included with this. Electron Microscopy (TEM)** Specimen Requirements. Contact Huntsville Hospital Pathology Department at 256-265-8090 to consult with a pathologist POLYCHROME METHYLENE BLUE The stain has a similarity with loeffers alkaline methylene blue. They are used for demonstration of Anthrax bacilli structure in the blood. Preparation. the same with loeffer alkaline methylene blue. After that distribute in the battle, record date label. Shake frequently before it can be ready for used, it takes several months, but it can be foster by treating wit

Toluidine Blue Vital Staining Iowa Head and Neck Protocol

Stains fungi, H.pylori, L. pneumophila and spirochete-infected tissue. ab150685. Sudan Black. Stains lipids and fat blue/black and nuclei red-Toluidine Blue Stain. Stains nucleic acids blue and polysaccharides purple. Mast cells are stained dark blue/red purple-Trichome Stain (Modified Masson's) Stains connective tissue. ab150686. Calcium Stain. Toluidine blue has been found to produce a level of contrast within the cells that allows chromosomes to be clearly seen. The protocol developed here, using toluidine blue, is a simpler process than protocols involving acetic orcein. The use of toluidine blue in a school laboratory is less hazardous than the use of acetic orcei

(PDF) Embedding, Serial Sectioning and Staining ofA-level set practicals - microscopy of root tip mitosis

Toluidine Blue - A Histology Stain for Mast Cells (and

A silver stain that was originally developed for staining glycogen and mucin, but is no longer used for that purpose is: Gomori's methanamine silver Dyes, such as toluidine blue O and thionin, that stain mucins and acid mucosubstances a different color from that of the dye solution, are called Toluidine Blue Stain, 1% (w/v) in 20% (v/v) Alcohol with 1% (v/v) Acetic Acid for Staining and Detection of Basal Cell Carcinoma on Frozen Sections. In-stock items ship in 2 to 3 business days or less. Made to order and custom items ship in as little as 7 to 10 days The use of toluidine blue, however, should not be excluded, because all in situ carcinomas and invasive carcinomas retain toluidine blue stain. 11 SpecificityPrevious studies demonstrated a great variation in the specificity of staining by toluidine blue of between 44% and 100%; this is due to the diversity of lesions included in the different. ted by toluidine blue stain or that may be difficult to dis- tinguish. Therefore, these methods can be recommended to facilitate nerve fiber counts in studies of peripheral nerve histology, using the rat and the rabbit as the experimental model. The choice of the staining method will, of course blue 1. any of a group of colours, such as that of a clear unclouded sky, that have wavelengths in the range 490--445 nanometres. Blue is the complementary colour of yellow and with red and green forms a set of primary colours 2. a. a sportsman who represents or has represented Oxford or Cambridge University and has the right to wear the university.

ab150673 H. Pylori Rapid Stain (Microorganism Stain) 7 5. Reagent Preparation 5.1 Periodic Acid Solution Ready to use as supplied. 5.2 Sodium Metabisulfite Solution Ready to use as supplied. 5.3 Alcian Yellow Solution Ready to use as supplied. 5.4 Sodium Hydroxide Solution (3%) Ready to use as supplied. 5.5 Toluidine Blue Solution 1 7. Next, students can stain the specimen by applying a drop of toluidine blue to one side of the coverslip, while drawing it through with a Kim Wipe at the other. Ask how the stain changed the appearance of the cells? Why? Have students sketch the sclerids. 8. Next, the students should prepare a mount of onion cells to compare to Elodea. To do. Nuclei= dark Nuclear red: nuclei = red Basic aniline dyes: e.g cresyl violet, toluidine blue They stain ergastoplasm in a different shade ( = metachromatically) than nuclei. Nissl staining( in the nervous system): nuclei = greenish blue, Nissl substance = reddis Toluidine Blue. Stains nucleus blue and cytoplasm light blue. Basic thiazine metachromatic dye with high affinity for acidic components, staining tissues rich in DNA and RNA. Connective tissue - (mucins and acid mucins) stain purple to red, background is stained blue. Mast cell granules - stain purple, due to the presence of heparin and histamine z Toluidine blue O (TBO) dye TBO is a polychromatic stain. Pectin will be red or reddish purple: lignin, blue; other phenolic compounds, green to blue-green. Thin-walled parenchyma will be reddish purple; collenchyma, reddish purple; lignified elements such as tracheary elements and sclerenchyma will appear green to blue-green; sieve tubes and companion cells, purple; middle lamella, red to.