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Hematology & Histology

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Stains, fixatives and the reagents diagnostic laboratories run on. Dyes are the unusual case in chemistry where the specification a supplier certifies — dye content — is only loosely related to how the material actually stains, which is why certified batches and in-house validation both exist.

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Listed on the TSS storefront and searchable there by name or CAS number. Every enquiry is contracted and invoiced by Taitil Global Inc. in the United States or Europe.

Specifying it

What decides the purchase

The compound is usually fixed by the route. These are the things that vary between suppliers and between lots.

  1. Certified dye content, and what it does not tell you

    Biological Stain Commission certification confirms the dye content and that the batch performed acceptably in a reference procedure. It does not guarantee identical behaviour in your protocol, because staining depends on fixation, section thickness and timing as much as on the dye. Certified batches narrow the variation; they do not remove the need to validate a new lot against a known slide.

  2. Dyes are mixtures, and the balance shifts between batches

    Many histological dyes are manufactured mixtures rather than single compounds, and the proportion of components varies between synthesis batches. That is why two lots at the same certified dye content can give different intensity or differential staining. Where a laboratory has validated a protocol, buying the same batch for as long as possible is worth more than buying the highest dye content.

  3. Fixative formulation is the whole result

    Ten percent neutral buffered formalin, formal saline and Bouin's are not interchangeable — they fix by different chemistry and preserve different antigens. For immunohistochemistry the fixative determines which epitopes survive to be detected. Specify the formulation and the buffer, not simply 'formalin'.

  4. Handling and disposal constrain what you can use

    Formaldehyde is a recognised carcinogen with tightening exposure limits, xylene carries its own controls, and picric acid in Bouin's is an explosion hazard when dry. These constrain storage, ventilation and waste routes as much as they constrain purchasing. Confirm the site can handle and dispose of the material before ordering it in quantity.

Questions

What does Biological Stain Commission certification actually certify?
That the batch was tested for dye content and impurities and performed acceptably in a standardised staining procedure. It is a batch-level certification rather than a product-level one, which is why the certificate carries a batch number. It substantially reduces the risk of an unusable lot; it does not remove the need to check a new batch against a known control slide before clinical use.
Why does the same stain give different results between lots?
Because most histological dyes are mixtures whose composition shifts between synthesis batches, and staining intensity depends on the balance of components rather than on total dye content alone. Fixation, section thickness and timing amplify the difference. Laboratories that depend on consistency generally validate each new lot and, where possible, reserve a batch to run for a whole study.
Can you supply ready-to-use solutions rather than powders?
For most common stains, yes, and it removes a preparation step and a source of variation. The trade-off is shelf life and shipping weight — solutions age and some are shipped as dangerous goods where the powder is not. For a laboratory running a validated protocol at volume, ready-to-use is usually the better answer; for occasional use, powder keeps longer.