I have recently begun playing with selenium and have some questions. I have learned how to get a range of tones from increased blacks through purpley browns on MGWT, but on MGIV I always seem to get a slight purple cast that I don't like. I really just want to make the prints pop a little more on MGIV without any noticeable color shift. I'm using KRST at 1:19 between 2 and 5 minutes. Should I dilute more and tone longer? Any suggestions would be great. Thanks.