Ponceau 4R (known by more than 100 synonyms,:460–461 including as C.I. 16255, Cochineal Red A, C.I. Acid Red 18, Brilliant Scarlet 3R, Brilliant Scarlet 4R, New Coccine,:460 is a synthetic colourant that may be used as a food colouring. It is denoted by E Number E124. Its chemical name is 1-(4-sulpho-1-napthylazo)- 2-napthol- 6,8-disulphonic acid, trisodium salt. Ponceau (French for \"poppy-coloured\") is the generic name for a family of azo dyes.

CAS：2611-82-7
中文别名：酸性红R;食用胭脂红;食品红 7;丽春红 4R;1-(4-磺酸-1-萘偶氮)-2-羟基-6,8-萘二磺酸三钠盐;新胭脂红;新胭脂红/胭脂红;酸性红18;亮丽春红5R;胭脂红A;酸性大红3R;
英文别名：AcidredR;Ponceau 4 R;E124;cochineal red A;Food Red No. 102;Brilliant ponceau 5R;AKA102;foodred7;New Coccine;1578red;foodred6;c.i.185;l-rot4;COCCINE;Red 18;
分子式：C20H11N2Na3O10S3
分子量：604.473
精确质量：603.927
Psa：241.69
Logp：6.0687

MDL号：MFCD00004084
BRN号：4122340
RTECS号：QJ6530000
EINECS号：220-036-2
PubChem号：24851935

外观与性状：红色粉末
稳定性：Stable under normal temperatures and pressures.
储存条件：Keep container closed when not in use. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.

安全说明：S22-S24/25

生产方法
1. 以 1，4-氨基萘磺酸和G 酸(2-naphthol-6,8-disulfonic acid) 为原料，将1,4-氨基萘磺酸重氮化，与G 酸偶合得产物。经盐析，过滤，干燥，粉碎得成品。 主要用于羊毛、蚕丝、锦纶的染色及羊毛、蚕丝织物的印花。坚牢度较差。还可用于纸张、皮革、肥皂等的着色。
用途
主要用于羊毛、蚕丝、锦纶的染色及羊毛、蚕丝织物的印花。坚牢度较差。还可用于纸张、皮革、肥皂等的着色。