Is there a shelf life on water soluble aniline dye once it’s been mixed?
Greg Williams: If it is kept in the dark, it will remain useable for quite some time. If stored in a glass jar with a metal top, it may corrode the top and contaminate the dye. Exposure of any of the dyes to strong sunlight will fade them.
Michael Dresdner: Another problem to be watchful for is mold or bacteria. While some dyes suppress mold growth, others do not, and that can alter both the color and smell.
