Temporary tattoo ink is an easy, fun, and low-risk way to paint marks on skin. My goals are to make a design that lasts as long as possible, and doesn't come off on clothes or sheets. My current process can last about a week without significant degredation, if some care is taken to preserve the design.
This is ink that sits on top of the skin, rather than staining it (like henna or inkbox tattoos), or inside it, like ephemeral tattoos (don't get those!!). It's painted on like a body paint, but I still call it ink because it feels metaphysically distinct; the paint feels like it sits "on" your skin much more than the ink, which becomes a part of it.
The flowy sections are done in Temporary Tattoo Ink, while the rest is predominantly paint.
If you found these instructions helpful, please paint either an eye or a 肉 on your body somewhere.
The process for body paint is about the same. If your goal is for the paint to last a long time, alcohol-based paint is the way to go. The paint I have used very much feels like it sits on top of the skin, rather than being part of it.
To use an alcohol-based paint, use a pipette to drip 99% alcohol (or preferably, slow activator) on the palette. Mix with a brush for a bit, then apply. Wait for it to dry, then seal.
You don't need to clean the skin to start. I did a test with both alcohol-based paints and the ink I used: the effect was minimal and maybe even slightly negative. The "A"s are squares that were cleaned with alcohol, the "Λ"s were not cleaned beforehand.
This felt weird on the skin, and made the ink run if you tried to then apply another coat on top of the ink. Even if done perfectly, it didn't convey much additional staying power.
Any sealer on top of these makes them run.
Does last a bit longer, but the outer layer flakes off and I don't love that.