Reactive Blue 4

Also known as: Procion Blue MX-R, Procion Brilliant Blue, C.I. Reactive Blue 4, C.I. 61205, Reactive Brilliant Blue X-BR, 1-Amino-4-[[3-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]-4-sulfophenyl]amino]-9,10-dihydro-9,10-dioxo-2-anthracenesulfonic acid, 1-Amino-4-[3-(4,6-dichlorotriazin-2-ylamino)-4-sulfophenylamino]anthraquinone-2-sulfonic acid, Mikacion Brilliant Blue S-R, Ambifix Blue CR, Active Brilliant Sky Blue KKH

Reactive Blue 4 (CAS 13324-20-4) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C23H14Cl2N6O8S2 and a molecular weight of 637.42900 g/mol. Key property: a density of 1.86g/cm3. It is classified under GHS with signal word Warning and hazard statements H319 — Causes serious eye irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 13324-20-4
Jingsj CID: J-29821-5
Molecular Formula: C₂₃H₁₄Cl₂N₆O₈S₂
Molecular Weight: 637.42900 g/mol
Category: Organic Compounds
Last updated: 8/21/2026

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Physicochemical Properties

Density	1.86g/cm3
Exact Mass	635.96900
PSA	248.39000
LogP	6.40540
Appearance	saline suspension
Refractive Index	1.774

GHS Safety & Compliance

IrritantSignal word: Warning

H319 — Causes serious eye irritation

Activity & Biological Data

Additional Information	[1]. Reactive Blue 4 as a Single Colorimetric Chemosensor for Sequential Determination of Multiple Analytes with Different Optical Responses in Aqueous Media: Cu2+-Cysteine Using a Metal Ion Displacement and Cu2+-Arginine Through the Host-Guest Interaction. [2]. Chaudhari AU, et al. Effective biotransformation and detoxification of anthraquinone dye reactive blue 4 by using aerobic bacterial granules. Water Res. 2017 Oct 1;122:603-613.

Additional Information

[1]. Reactive Blue 4 as a Single Colorimetric Chemosensor for Sequential Determination of Multiple Analytes with Different Optical Responses in Aqueous Media: Cu2+-Cysteine Using a Metal Ion Displacement and Cu2+-Arginine Through the Host-Guest Interaction. [2]. Chaudhari AU, et al. Effective biotransformation and detoxification of anthraquinone dye reactive blue 4 by using aerobic bacterial granules. Water Res. 2017 Oct 1;122:603-613.

Frequently Asked Questions

What is the CAS number of Reactive Blue 4?

The CAS number of Reactive Blue 4 is 13324-20-4.

What are the molecular formula and molecular weight of Reactive Blue 4?

Reactive Blue 4 has molecular formula C23H14Cl2N6O8S2 and molecular weight 637.42900 g/mol.

Is Reactive Blue 4 hazardous?

Reactive Blue 4 has GHS signal word Warning and hazard statements H319 — Causes serious eye irritation.

What are the upstream and downstream products of Reactive Blue 4?

For Reactive Blue 4, Upstream Products: 1-amino-4-bromoanthraquinone-2-sulfonic acid sodium salt.

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. "Reactive Blue 4 (CAS 13324-20-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-29821-5 (accessed 2026-11-09).

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