Please explain to me how the dyes are stabilized and protected in a 3 solution developing kit? I don't doubt that one can get nice results that look great right after processing, but long-term stability has to be compromised if a pre-bleach is not used...or a formalin-containing stabilizer final rinse.
The threebath kit is really a four bath kit, and the six bath kit is a seven bath kit. They both contain a stabilizer soulution that is used after the final wash. The tree baths of the three bath kit are the first developer, the color developer, and the blix. Washes are used to isolate the steps.