These wipes/swabs are used in the USA hospitals for identification purposes of newborn babies (they are also used by the FBI for the not-so-innocent members of the public)!

1 wipe / swab will take around 6-10 prints (depending on the size of baby).

Although the inkless wipe is inkless, there will be some residue after the hand/foot has made contact with the specially coated card, the hand/foot can be easily washed clean with soap and water.