Tsukineko VersaFine Clair Ink Pads
Love the pigment ink colors available and the way this ink works on cheaper acrylic stamps, as well as photopolymer and even rubber.
I would caution you to stamp on a separate piece of paper, particularly if this is the first time the stamp is used; this way you can tell if the ink color is what you want before you stamp onto your project and also to tell if a 2nd or 3rd generation stamping will work better. I would also use a stamping platform if you have one available.