How to use Psoralea corylifolia tincture? Do you paint it before lighting? How long does it take to light up after smearing? Do you need to wipe off Psoralea tincture when it is illuminated? Does it need to be erased after illumination? Apply it before sun exposure, then remove the covering from the affected area, sun it until it turns red (usually about half an hour), and then wash it off with clear water. If dosage is used, use it according to the instructions first. If the skin turns red easily or lasts for a long time after exposure, it means that your skin is very sensitive to this drug. It can be diluted with Chinese liquor or alcohol for 3-5 times before external use.

I hope it works for you!