In fact, there are no tattoos that are intentionally exposed to heat. The closest thing is getting a tattoo with pigeon blood. However, a dove blood tattoo is not an invisible tattoo.

Moreover, pigeon blood is used for tattoos. As an animal, the blood may carry pathogens (microorganisms and parasites such as bacteria and viruses) and transmit certain diseases or even dangerous diseases. Macromolecular substances such as proteins in heterogeneous blood Directly entering the skin and subcutaneous is likely to cause allergies or be absorbed by the skin, causing other diseases and causing harm to human health, so it is better to avoid it. Extended information

Pigeon blood tattoo is to use pigeon blood mixed with white wine and cinnabar tattoo. It is usually colorless, but will appear red after drinking, sweating or being excited, so it is also called a drunken tattoo or invisible tattoo.

In fact, it’s not that evil. However, after drinking alcohol, the color will be darker, that is, the red color will be heavier, because the effect of alcohol speeds up blood circulation. Reference material? Baidu Encyclopedia Pigeon Blood Tattoo