There was a patch for self-applying tattoos without pain and blood.

The microneedles in the patch are smaller than a grain of sand. They are made from ink embedded in a soluble matrix. When they are pressed into the skin, the base “melts”, and pigment remains on the body. That is, it is enough to apply microneedles once, and an ordinary tattoo artist pierces the skin many times. Using the patch, you can apply a regular pattern, as well as an image with letters, numbers and symbols. The study showed that tattoos last at least a year. They will probably stay forever.