Ponceau 2R, Xylidine ponceau, Ponceau G, Red R, Acid Red 26, Food Red 5, or C.I. 16150 is a red azo dye used in histology for staining. It is easily soluble in water and slightly in ethanol. It usually comes as a disodium salt.

CAS：3761-53-3
中文别名：丽春红G;丽春红C;酸性大红;罂粟红2R;酸性红26;酸性猩红;丽春红2R;二甲苯胺丽春红;罂粟红R;
英文别名：ACID RED 26;ponceauj;Xylidine Ponceau 2R;Ponceau Xylidine;acid scarlet;c.i.79;Xylidine ponceau;red101;ponceaufr;AKA503;ponceaugr;redr;Acid Red 26,Ponceau 2 R,Xylidine ponceau 2R;1695red;Ponceau de Xylidine;ponceaug;
分子式：C18H14N2Na2O7S2
分子量：480.423
精确质量：480.004
Psa：176.11
Logp：5.5474

UNII：U3J3635T4U

外观与性状：暗红色结晶粉末

RTECS号：QJ6825000
安全说明：36-53-45
危险类别码：R20/21; R33
WGK Germany：3
危险品标志：Xn

用途
用作生物染色剂和银的检定等。