it really depends on how long you leave the dye on your hair. Like 15 mins should stay in a couple weeks and any longer like 30 mins I did stayed good color for a month. It will start to fade to a lighter color after a while to a lighter pink.
I Actually Still Have The Bleach To Go With This & If The Winner Of This Is Interested In It, Just Let Me Know And I'll Put It Up For Auction. Sorry For Posting On Your Wall, I Just Have It And Wanted To Help Some People Help. Hope I'm Not A Bother.
I've heard that you can reuse splat products after opened if you don't need to use the whole bottle of color at once. I have used half a bottle before and put lid back on and month or two later used other half bottle and it worked just the same as the first time. If that helps any, not a dumb ? a good one :)