Auramine O

Also known as: Auramine, Basic Yellow 2, C.I. Basic Yellow 2, C.I. 41000, Pyoktanin Yellow, Pyoktaninum aureum, Canary yellow, Aminotetramethyl diaminodiphenyl methane hydrochloride, 4,4'-Carbonimidoylbis(N,N-dimethylaniline) monohydrochloride

Auramine O (CAS 2465-27-2) is a compound in the Organic Bases category listed in the Jingsj chemical database. It has the molecular formula C17H22ClN3 and a molecular weight of 303.830 g/mol. Key properties include a melting point of >250 °C (dec.)(lit.), a boiling point of 406.2ºC at 760mmHg, a density of 1.01g/cm3 and a flash point of 199.4ºC. It is classified under GHS with signal word Danger and hazard statements H302 — Harmful if swallowed, H311 — Toxic in contact with skin and H351 — Suspected of causing cancer. It is listed by 1 supplier; request a quote for pricing. Record last updated Nov 3, 2026.

CAS No.: 2465-27-2
Jingsj CID: J-19714-2
Molecular Formula: C₁₇H₂₂ClN₃
Molecular Weight: 303.830 g/mol
Category: Organic Bases
Last updated: 11/3/2026

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Physicochemical Properties

Melting Point	>250 °C (dec.)(lit.)
Boiling Point	406.2ºC at 760mmHg
Density	1.01g/cm3
Flash Point	199.4ºC
Exact Mass	303.150238
PSA	30.33000
LogP	4.13650
Vapor Pressure	8.31E-07mmHg at 25°C

GHS Safety & Compliance

Acute Toxicity / Health HazardSignal word: Danger

H302 — Harmful if swallowed
H311 — Toxic in contact with skin
H351 — Suspected of causing cancer

Activity & Biological Data

Additional Information	[1]. Kommareddi S, et al. Nontuberculous mycobacterial infections: comparison of the fluorescent auramine-O and Ziehl-Neelsen techniques in tissue diagnosis. Hum Pathol. 1984 Nov;15(11):1085-9. [2]. Hosseinpour S A, et al. Use of metal composite MOF‐5‐Ag2O‐NPs as an adsorbent for the removal of Auramine O dye under ultrasound energy conditions. Applied Organometallic Chemistry, 2018, 32(2): e4007.

Additional Information

[1]. Kommareddi S, et al. Nontuberculous mycobacterial infections: comparison of the fluorescent auramine-O and Ziehl-Neelsen techniques in tissue diagnosis. Hum Pathol. 1984 Nov;15(11):1085-9. [2]. Hosseinpour S A, et al. Use of metal composite MOF‐5‐Ag2O‐NPs as an adsorbent for the removal of Auramine O dye under ultrasound energy conditions. Applied Organometallic Chemistry, 2018, 32(2): e4007.

Customs & Trade Information

HS Code	2925290090
Summary	2925290090 other imines and their derivatives; salts thereof。Supervision conditions:None。VAT:17.0%。Tax rebate rate:9.0%。MFN tariff:6.5%。General tariff:30.0%

Frequently Asked Questions

What is the CAS number of Auramine O?

The CAS number of Auramine O is 2465-27-2.

What are the molecular formula and molecular weight of Auramine O?

Auramine O has molecular formula C17H22ClN3 and molecular weight 303.830 g/mol.

Which suppliers offer Auramine O?

1 supplier(s) listed; request a quote for pricing.

Is Auramine O hazardous?

Auramine O has GHS signal word Danger and hazard statements H302 — Harmful if swallowed; H311 — Toxic in contact with skin; H351 — Suspected of causing cancer.

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

Last updated: 11/3/2026

How to cite: Jingsj. "Auramine O (CAS 2465-27-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-19714-2 (accessed 2026-11-06).

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