Quite often you end up with little quantities of dye mixture. Of course you can throw this away, but you can also pour this into ice cube trays. The fun part is that when the dye mixture is in the tray you cannot see anymore which color it was. Serendepity! Next day I soda soaked 2 fq's of fabric and crunched these into a container. On this fabric I emptied an ice cube tray which held different colors of dye mixture and let it melt. When the ice cubes were melting I could slowly see some of the colors, but in total the fabric still looked very dark. After rinsing and washing this is how it looks:
There are different opinions on how long you can keep the dye mixture frozen, but this fabric was down with 1-day old ice cubes. In my freezer are some ice cubes which are by now several months old. One of the coming days I intend to use these and see how much color they still have.