Tattoo Baby Handprints What Ink Pad's Are Safe To Use With Baby?

What ink pad's are safe to use with baby? - tattoo baby handprints

I tattooed my daughter Footprints on me next week. I bought a Martha Stewart acid-free ink pads to the hospital from its title (not, therefore I am), this kind of requirement for safe use in it?
I hear Babies R Us offers special packages for fingerprints and footprints, but I went there today and they said they have more to save. When the ink acid is not safe to use on the type of stamp pads that come in kits, too?