Here's a little tip on what to do when you start using a new My Acrylix Stamp:
All stamps will stain a little when used, but to prevent your new stamp from staining badly, prime it first. Start by 'stamping it off' with a LIGHT colored ink, like Bamboo. Stamp it off on a scratch paper, then clean it. This will prep your stamp and allow it to clean up better when using a darker color ink. Keep in mind that all darker colors, especially those in the navy blue and red families, will stain, no matter what brand you use.
I also recommend using only Close to My Heart ink pads. When I first started buying CTMH stamps about 6 years ago, I thought I could get away with using the inks I had in my stash - various types purchased from the big box crafting stores. All of my older stamp sets are stained and it is easy to pick out the first bunch of stamp sets I purchased! Even though they are stained, they still stamp the same perfect image - I'm just a stickler for keeping my stamps in 'like new' condition!