CAS Number	2611-82-7
Molecular Formula	C20H14N2O10S3.3Na
Molecular Weight	607.50
InChI Key	JLNHICQMWZYSRJ-UHFFFAOYSA-N
Synonyms	1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-[2-(4-sulfo-1-naphthalenyl)diazenyl]-, sodium salt (1:3) C.I. Acid Red 18 Ponceau 4R C.I. Acid Red 18, trisodium salt 1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-[(4-sulfo-1-naphthalenyl)azo]-, trisodium salt 1578 Red C.I. 16255 Acidal Bright Ponceau 3R Acid Brilliant Scarlet 3R Acid Ponceau 4R Acid Red 18 Acid Scarlet 3R Acid Scarlet 3RZ Acilan Scarlet V 3R Aizen Brilliant Scarlet 3RH Atul Acid Scarlet 3R Atul Scarlet F Brilliant Ponceau 3R Brilliant Ponceau 3RF Brilliant Ponceau 4R Brilliant Ponceau 4RC Brilliant Ponceau 5R Brilliant Ponceau 4RC Specially Pure Brilliant Scarlet Brilliant Scarlet 4R Bucacid Brilliant Scarlet 3R Calcocid Brilliant Scarlet 3RN Certicol Ponceau 4RS Cilefa Ponceau 4R Acid Scarlet 4R Coccine Coccin Red Cochineal Red A Cochineal Red 4R Cochineal Red A Specially Pure Colacid Ponceau 4R C.I. Food Red 7 Curol Bright Red 4R Daishiki Brilliant Scarlet 3R Edicol Supra Ponceau 4R Eurocert Cochineal Red A Fenazo Scarlet 3R Food Red 7 HD Ponceau 4R HD Ponceau 4R Supra Hexacol Ponceau 4R Hidacid Fast Scarlet 3R Hispacid Brilliant Scarlet 3RF Java Scarlet 3R Kayaku Acid Brilliant Scarlet 3R Kayaku Food Colour Red No. 102 Kiton Scarlet 4R Kochineal Red A for Food Naphthalene Ink Scarlet 4R Naphthalene Scarlet 4R Neklacid Red 3R Neklacid Red 4R New Coccin New Coccine Extra Conc. A Export New Coccine Extra Pure A Ponceau 4RF Ponceau 4RE-FQ Ponceau 4RE Ponceau 4RT Pontacyl Scarlet RR Rakuto Brilliant Scarlet 3R San-ei Brilliant Scarlet 3R Scarlet 4R Scarlet 4RA Strawberry Red A Geigy Sugai Brilliant Scarlet 3R Symulon Acid Brilliant Scarlet 3R Takaoka Brilliant Scarlet 3R Trisodium 1-(4-sulfo-1-naphthylazo)-2-naphthol-6,8-disulfonate Victoria Scarlet 3R Victoria Scarlet Red Neucoccin New Coccine L-Red 4 Naphthalene Scarlet 4RS Strawberry Red Food Red Number 102 Food red 102 Red 102 Food Red No. 102 Edicol Supra Ponceau 4RS Lissamine Scarlet 4R E 124 Brilliant Scarlet 3R Japan Red 102 Aizen Food Red 102 Japan Red No. 102 Japan Food Red 102 Naphthalene Scarlet Red 4RS Cochineal Red 70 Purple Red Duasyn Acid Ponceau 4RC Edicol Ponceau 4R Vitasyn Ponceau 4RC82 AR 18 Acid Red 3R Sicovit Cochineal Red 80E124 Orient Water Red 1 Water Red 1 Ponceau 4R-E 124 Triacid Scarlet 3R Ichoacid Scarlet 4RS Basacid Red 405 Cogilor Red 320.11 Conacid Red AM Water Scarlet 176576 Kemacid Scarlet 3R Libacid Scarlet L 3R Vicoacid Scarlet 3R Romexal Ponceau 4R Solcoderm Red F 4R Dynacid Red 3R Cogilor Red 320.12 Pacid Scarlet 3R BTK Scarlet 3R Acid Brilliant Scarlet BR Dinacid Scarlet 3R Apollo Acid Brilliant Scarlet 3R Ponceau 4R90142 Basovit Red 400E Eurocert Ponceau 4R311821 Multacid Scarlet 3R Dermacid Scarlet 3R Indacid Scarlet 3R Ponceau 4R36029 Triacid Ponceau 4R Ponceau 4R307014 Dycosacid Scarlet 2R Water Scarlet 176557 Dyacid Scarlet 4R Concorde Acid Brilliant Scarlet M 3R Ponceau 4R36002 Ponceau 4R307011 New coccine red Red No. 102 Ponceau 4R supra Sanolin Ponceau 4RC82 Azo dye AR18 Puricolor Red ARE 18

Applications:

Uv-Vis Spectrum of Ponceau 4R

April 9, 2026

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For optimal results in HPLC analysis, it is recommended to measure absorbance at a wavelength that matches the absorption maximum of the compound(s) being analyzed. The UV spectrum shown can assist in selecting an appropriate wavelength for your analysis. Please note that certain mobile phases and buffers may block wavelengths below 230 nm, rendering absorbance measurement at these wavelengths ineffective. If detection below 230 nm is required, it is recommended to use acetonitrile and water as low UV-transparent mobile phases, with phosphoric acid and its salts, sulfuric acid, and TFA as buffers.
For some compounds, the UV-Vis Spectrum is affected by the pH of the mobile phase. This analysis was done with the mobile phase made of 20% acetonitrile and 80% water.

Ponceau 4R

SIELC Technologies usually develops more than one method for each compound. Therefore, this particular method may not be the best available method from our portfolio for your specific application. Before you decide to implement this method in your research, please send us an email to research@sielc.com so we can ensure you get optimal results for your compound/s of interest.

Ponceau 4R

Applications:

Uv-Vis Spectrum of Ponceau 4R

April 9, 2026

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Ponceau 4R

Applications:

Uv-Vis Spectrum of Ponceau 4R

April 9, 2026

Access the UV-Vis Spectrum SIELC Library

If you are looking for optimized HPLC method to analyze Ponceau 4R check our HPLC Applications library

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