... promote the degradation and fading.Soluble in water and aqueous, insoluble in nonpolar solvent. This product aqueous medium pH value with increased, the ... is decreased obviously.Tonal with medium pH value solution by 2.0 to 8.0 and in turn show: orange red ... water solution is not stable, increases with temperature, degradation accelerated, and fade away, but in acidic condition is stable.Cu2 + can ...