Over-dye

After rinsing the last batch in the machine on hot, I thought the temperature of the water was dispersing too much color. Now I believe it is the tossing. This batch, rinsed in the machine only on cold, also went too light, but not as light as the hot wash out. Everything else was the same: the soda ash prep and the dye solution. I wondered if the dye solution changes as it is used or as it sits. Different pigments can get left behind and change the concentration as many shirts are dyed. I don't know if I need to make a fresh batch of blue each time.
To remedy the lightness, I stuck the shirts into an old bucket of Brilliant Blue from another project and let that sit overnight. I rinsed only twice on cold and then soaked it in the fixative.
The two tones of blues makes a neat effect and I'll have to remember that as an option for custom work. I'll call it "over-dying" since a darker color was dyed over a lighter color.