I am using McCormick food colorings as my dye. I soaked my wool in water, then in a water/vinegar mixture. I am dyeing eight pieces of roving that are about 1 ounce each.
I used the microwave method, 2 minutes in the microwave, 5 minutes rest. I did this rotation quite a few times. The color is supposed to get completely absorbed by the wool and that did not happen. I rinsed them a few times and they were still not colorfast. I ended up putting them in a vinegar water solution and that solved the problem and the water remained clear. I do not think I let the roving soak long enough in the vinegar water during the first soak.
After dyeing these, I was reading online that some of the food colors may not be light fast. So I plan to do a light fast test on these before putting them in a final project. But they will be fun to play with in my felting class samples.