Pigeon blood tattoo that is mixed with pigeon blood white wine, vermilion tattoo. Normally colorless, but after drinking, sweating or excitement will show red, so it is also known as drunken tattoo or invisible tattoo. In fact it is not so evil. However, after drinking alcohol is the color will be darker, that is, the red is a little heavier, because the role of alcohol makes the blood circulation speed up caused by.