Okay, I used a classic ink with the first one. Didn't let it dry to long, then used a heat gun. Ink mostly disappeared, and what did remain came off on my fingers when I touched it.
Tried a second one with StaZon black, coloured the heart in with pastels. That one worked. I've set it with a Krylon spray as the pastels still came off a bit.
Oh, and this time I lightly sanded the polyshrink before stamping on it.
Guess I'll change the card from chocolate chip and pink to black and pink. Aw well, that's all part of the creative process, eh?
Thanks for the pointers, ladies.
KGidget