FD&C Red No. 4 (Ponceau SX, C.I. 14700)

At a Glance

Material Family

Surfactants - Anionic

Record Type

Pure compound

Primary Role

Cleaning / Degreasing · Wetting

Functional Roles

Cleaning / Degreasing Wetting Color / Pigmentation

INCI Name

ACID BLUE 9 AMMONIUM SALT

CosIng Functions

HAIR DYEING

Industries Served

Beauty & Personal Care Coatings & Construction Food & Beverage HI&I Cleaning Industrial Manufacturing Plastics & Polymers Textiles

Applications & Use Cases

▸ Textile dyeing: red colorant for wool, silk and nylon
▸ Paper and soap: water-soluble red for paper and soap coloring
▸ Wood staining: applied as a red wood stain
▸ Biological staining: used as a biological stain and indicator

Physical Properties

Solubility

Soluble in water (5% at 20 °C and 98 °C) and in ethanol

Safety & Handling

Full SDS available on request

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 →

HS / Tariff Classification

Harmonized System (HS) Code — 6-digit international heading

3204 . 12

Chapter 32

Tanning or dyeing extracts; pigments; paints and varnishes

Heading 32.04

Internationally harmonized (WCO HS)

Subheading 3204.12

6-digit international code — national tariff line adds further digits

Chemical Identity

CAS Number

4548-53-2

Molecular Formula

C18H14N2Na2O7S2

Molecular Weight

480.4 g/mol

IUPAC Name

disodium;3-[(2,4-dimethyl-5-sulfonatophenyl)diazenyl]-4-hydroxynaphthalene-1-sulfonate

INCI Name

ACID BLUE 9 AMMONIUM SALT

PubChem CID

62542

InChI Key

ONTQJDKFANPPKK-UHFFFAOYSA-L

Synonyms & Trade Names

FD&C Red 4 Ponceau SX C.I. Food Red 1 Food red 1 Crimson 4R FD&C Red No. 4 FD & C Red no. 4 C.I. Food Red 1, disodium salt FD and C Red No. 4 1-Naphthalenesulfonic acid, 3-((2,4-dimethyl-5-sulfophenyl)azo)-4-hydroxy-, disodium salt 3-((2,4-Dimethyl-5-sulfophenyl)azo)-4-hydroxy-1-naphthalenesulfonic acid, disodium salt disodium;3-[(2,4-dimethyl-5-sulfonatophenyl)diazenyl]-4-hydroxynaphthalene-1-sulfonate Red 4 Ponceau SX Lake

Full Description

FD&C Red No. 4 (Ponceau SX, CAS 2650-18-2) is a water-soluble monoazo acid dye supplied as a red colorant. Established uses include dyeing wool, silk, nylon, paper and soap, wood staining, and service as a biological stain and indicator.

Frequently Asked Questions

What is FD&C Red No. 4?

FD&C Red No. 4 (Ponceau SX, CAS 2650-18-2) is a water-soluble monoazo acid dye supplied as a red colorant. Established uses include dyeing wool, silk, nylon, paper and soap, wood staining, and service as a biological stain and indicator.

How is FD&C Red No. 4 made?

It is a synthetic monoazo dye (Ponceau SX) produced by chemical synthesis, not derived from animal or insect sources such as carmine. The CAS number is 2650-18-2.

What is FD&C Red No. 4 used for?

It is used as a water-soluble red colorant for textiles (wool, silk, nylon), paper, and soap, as a red wood stain, and as a biological stain and indicator.

What does kosher certification mean for this dye?

Kosher means the material is produced under kosher certification. Request the current certificate and CoA with your order to confirm the certifying authority and the specifications it covers.

What is the cost of bulk FD&C Red No. 4?

Bulk pricing depends on grade, volume, packaging, and delivery location. RawSource supplies industrial quantities — request a quote with your volume, kosher certification, and CoA/SDS requirements for delivered pricing.

Related Products

Disclaimer. Information on this page — including properties, identifiers, hazard, transport (DOT/UN) and tariff (HS) classifications, and applications — is provided for general reference and is compiled from authoritative public sources (e.g. PubChem/ECHA, 49 CFR 172.101, the Harmonized Tariff Schedule). Values are typical and are not a guaranteed specification; the Certificate of Analysis (CoA) for the lot purchased governs. Products are sold for industrial and professional use only. Nothing here is a medical, health, or efficacy claim or advice. Always consult the current Safety Data Sheet (SDS) before handling, storage, transport or disposal, and confirm regulatory status, classification and suitability for your application and jurisdiction. Hazard, transport and tariff classifications must be verified for your specific shipment. RawSource makes no warranty, express or implied, and assumes no liability for use of this information. Trademarks. Third-party trademarks and brand names are the property of their respective owners; any reference is nominative — used only to identify a comparable product — and does not imply affiliation with, sponsorship by, or endorsement by the trademark owner.