This is how I set up the glaze "stations". Students would get their glazes from me, but if they had left-over, or when they were finished, they would simply place their cup of glaze in to the labeled area. Each day they came in, they knew where to look for their desired color(s). It helped me to keep it organized. The kids handled it really well. Waste was not an issue.
I had a table in the front of the room with sample pieces so the kids could see what the colors will look like.