Thionin acetate salt is a certified metachromatic biological stain with dye content ≥85 %, used for histology, hematology and microbial identification applications such as Nissl staining of neuronal cell bodies.
Thionin acetate salt, catalogue No. 861340, is a metachromatic cationic dye supplied by MilliporeSigma / Merck and certified by the Biological Stain Commission (BSC) with a dye content of ≥85 %. The compound, also known by synonyms such as 3,7-diamino-5-phenothiazinium acetate and Lauth’s violet, is widely used as a biological stain, particularly in histology, hematology and diagnostic assay development. Thionin has been used in Nissl staining protocols for the visualization of neuronal cell bodies and other microanatomical structures, and its spectral characteristics are suitable for a range of microscopy and staining techniques.
Advantages
- Cationic metachromatic dye with established staining properties.
- Certified by the Biological Stain Commission for reliable quality.
- Dye content ≥85 % supports consistent staining performance.
- Suitable for histology, hematology and microbial identification assays.
- Used in classical staining protocols such as Nissl staining of neurons.
Technical specifications
| Chemical name | Thionin acetate salt |
| CAS number | 78338-22-4 |
| Empirical formula | C12H9N3S · C2H4O2 |
| Molecular weight | 287.34 g/mol |
| Dye purity | ≥85 % |
| Form | Powder |
| Colour index number | 52000 |
| Typical applications | Histology, hematology, microbial staining |
| Storage conditions | Room temperature, dry |
| Brand | Merck |
