About 2 months ago there was a discussion on the DyersList on how long procion dyes could be kept frozen. According to a number of members the strenght of the color would disappear very quickly. Well I can say that I have proof that they are wrong. This picture shows the fabric I dyed using frozen dyeconcentrate which was one day old:
I emptied different blue dye concentrate - one was turquoise, I think the other one was mixing blue but I am not 100 certain on that - into an ice cube container. Put it into the freezer till the next day. Soda soaked fabric was crunched into a container and the ice cubes were placed on the fabric where they melted. I did not use all the ice cubes and put the remaining ones back into the freezer. This was done on February 24.
This week I used up the ice cubes and this is the fabric which I dyed with them: