rookie,

I have prepared RIT super-strength by mixing one package of dye and 1 cup of hot water. The solution is stored in screw-capped glass jars. When I want to dye something, I use one tablespoon of the prepared dye solution for every two cups of boiling water. I have had no problems with this method. The solutions of prepared dyes that I have are over two years old.

Now, if you're asking about placing dye that you've just used into a container for use at a later date, I cannot say that will work. I tend to think that the dye will be weakened somewhat.

H.