I just checked the red cross site about blood donations after tattoos, looks like it's state by state:
Wait 12 months after a tattoo if the tattoo was applied in a state that does not regulate tattoo facilities. This requirement is related to concerns about hepatitis. Learn more about hepatitis and blood donation.
Acceptable if the tattoo was applied by a state-regulated entity using sterile needles and ink that is not reused. There are 32 states that currently regulate tattoo facilities. You should discuss your particular situation with the health historian at the time of donation.
http://www.redcrossblood.org/donatin...etical-listing