Okay!!! So I tried the salt trick in with a color on one of my male clients.  It totally liquified the color!  It was such a mess-is this normal?  So I tried it both ways- just with the color, and then let it sit, then apply the normal color on top-but then it liquified that color I put on top.  Then I put lightener on his ends for the last 10 minutes and it liquified that, too.  It was dripping everywhere!   So we'll see if it covers better, but it was not a great experience!  Good thing he's been a faithful client for 3 years and ended up tipping me more because he knew I was trying real hard, but dang!