Tim Donnelly, a vegan, wrestles with tattoo ethics after finding out that there are "charred bones of dead animals in the ink, fat from once-living things in the glycerin that serves as a carrying agent, [and] enzymes taken from caged sheep that go into making the care products":
For some veggies I talked to, it seems the concern is similar to one they have about sugar: most mass-produced sugar is made using a process that includes bone char, making tons of delicious, sweet, and seemingly harmless things decidedly not vegan, or even vegetarian, but devilishly hard to avoid.
The Dish 