... .Easy oxidation. Sun exposure can promote the degradation and fading.Soluble in water and aqueous, insoluble in nonpolar solvent. This product aqueous medium pH ... medium pH value solution by 2.0 to 8.0 and in turn show: orange red-pink-red-violet. This product to ... is not stable, increases with temperature, degradation accelerated, and fade away, but in acidic condition is stable.Cu2 + can speed up its ...