Hey Paula and dye friends, I have a question: can urea solution be stored? I’m going to be doing some fiber reactive periodically over the next month, and it would be nice not to have to mix it every day I need it. Thanks!
— Tracy Benton [on Facebook]
Urea can go bad. When it does, it smells like ammonia. Store urea solution in the refrigerator, and always give it a sniff before using. If it smells like ammonia, do not use it, because it can mess up the pH of your dyeing reactions and have unpredictable effects. In contrast, you can store soda ash solution forever; it never goes bad.