Toluidine Blue O

Also known as: Tolonium chloride, Basic Blue 17, C.I. 52040, C.I. Basic Blue 17, Blutene chloride, Methylene Blue T50 or T extra, 3-Amino-7-(dimethylamino)-2-methylphenothiazin-5-ium chloride, 3-Amino-7-dimethylamino-2-methylphenazathionium chloride, 3-Amino-7-(dimethylamino)-2-methylphenothiazinium chloride, 7-Amino-N,N,8-trimethyl-3H-phenothiazin-3-iminium chloride, Dimethyltoluthionine chloride, CI NO 52040, EINECS 202-146-2, MFCD00011934, PHENOTHIAZIN-5-IUM, 3-AMINO-7-(DIMETHYLAMINO)-2-METHYL-, CHLORIDE, T C666 BN ISJ E1 FZ LN1&1 &&Chloride, Toluidine Blue O, pure

Toluidine Blue O (CAS 92-31-9) is a compound in the Solvents category listed in the Jingsj chemical database. It has the molecular formula C15H16ClN3S and a molecular weight of 305.826 g/mol. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 92-31-9
Jingsj CID: J-21583-9
Molecular Formula: C₁₅H₁₆ClN₃S
Molecular Weight: 305.826 g/mol
Category: Solvents
Last updated: 8/21/2026

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Physicochemical Properties

Exact Mass	305.075348
PSA	70.39000
LogP	1.27240

Activity & Biological Data

Additional Information	[1]. Sridharan G, et al. Toluidine blue: A review of its chemistry and clinical utility. J Oral Maxillofac Pathol. 2012;16(2):251-255.

Customs & Trade Information

HS Code	2934300000
Summary	2934300000. other compounds containing in the structure a phenothiazine ring-system (whether or not hydrogenated), not further fused. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

Frequently Asked Questions

What is the CAS number of Toluidine Blue O?

The CAS number of Toluidine Blue O is 92-31-9.

What are the molecular formula and molecular weight of Toluidine Blue O?

Toluidine Blue O has molecular formula C15H16ClN3S and molecular weight 305.826 g/mol.

What are the upstream and downstream products of Toluidine Blue O?

For Toluidine Blue O, Upstream Products: o-Toluidine hydrochloride, N,N-Dimethyl-p-phenylenediamine dihydrochloride.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "Toluidine Blue O (CAS 92-31-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-21583-9 (accessed 2026-11-06).

Data for reference only; verify product details with suppliers before purchase.