BASIC BLUE 9- ▸ Dyeing: Colorant for paper, textiles, silk, and leather
- ▸ Biological staining: Bacteriological and microscopy stain
- ▸ Redox indicator: Indicator in oxidation-reduction titrations
- ▸ Laboratory reagent: Chemical reagent and colorimetric agent
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
Request SDS →Methylene blue (CAS 61-73-4) is a synthetic cationic thiazine (azine) dye supplied to USP specification. It is used as a dye for paper, silk, cotton, wool, and leather, as a biological and bacteriological stain, and as a redox indicator and reagent in oxidation-reduction titrations.
Frequently Asked Questions
What is the use of methylene blue USP?
Methylene blue (CAS 61-73-4) is a synthetic cationic thiazine dye supplied to USP specification. It is used as a dye for paper, silk, cotton, wool, and leather; as a biological and bacteriological stain; and as a redox indicator and reagent in oxidation-reduction titrations. RawSource supplies it in bulk for dyeing, laboratory, and reagent use.
What does USP mean on methylene blue?
USP indicates the material meets the United States Pharmacopeia compendial specification for identity and purity. RawSource supplies methylene blue to USP grade with a Certificate of Analysis documenting conformance.
What type of compound is methylene blue?
It is a synthetic cationic thiazine (azine) dye, formula C16H18ClN3S, CAS 61-73-4. The cationic dye structure is the basis of both its textile-dyeing affinity and its function as a redox indicator.
What is methylene blue used for in the laboratory?
It serves as a biological and bacteriological stain for microscopy, as a redox indicator in oxidation-reduction titrations, and as a general colorimetric reagent. The HS code is 3204.13 (basic dyes).
What bulk packaging and documentation are available?
RawSource supplies USP-grade methylene blue in bulk with a Certificate of Analysis and Safety Data Sheet per shipment. Request a bulk quote with your target volume and grade for current pricing and lead time.