I've followed guidelines and a couple of my soaps do not care! They leave colored suds no matter what. The blue oxide and TD and activated charcoal have not, nor the copper sparkle mica and aqua mica. The green chrome oxide and yellow oxide both have left noticeable color suds. The yellow was only 1/3 the soap too. I did the green on two different soaps and it really isn't a lot, yet there it is green water. Do you find problems with colors running? I seriously do not understand how one can make a rainbow bright cake soap and not wind up with severely discolored water. Is it by manufacturers, some colors are more prone, user error, all of the above? Any insight welcome!