(2) Solubility: This product is slightly soluble in ethanol, but insoluble in oil. It has the characteristics of acid dyes and can color animal fibers.
(3) Spectral characteristics: 100mL of ammonium acetate solution containing 0.00 1g of this product has a maximum absorption wavelength of 525±2nm.
(4) Chromatography: Take the sample aqueous solution for paper chromatography, and the Rf value of the main color point should be the same as that of the standard sample.
Chromatographic conditions on paper: developing agent is n-butanol: anhydrous ethanol: ammonia water (1%) = 6: 2: 3; The temperature is 20-25 DEG C; The concentration of test solution is 0.1g/100 ml; The dosage of test solution is 0.002 ml; ; Developer front end rising150mm