Rigid Collodion - How To Scar, also called "Scarring Liquid", is a viscous, yellowish substance widely used in theatrical makeup special effects to simulate shapes of wounds and scars.
It's particularly popular for rendering The Joker cheek scars. It works by wrinkling the skin as it dries, leaving a puked area very similar to healed scars.
Rigid Collodion will allow you to achieve a very realistic healed scar effect for a prank or , combined with an heavy makeup, obtain a spectacular theatrical effect suitable for an Halloween mask for example.
The Scarring Liquid will be applied directly with a small brush on very clean and dry skin, allowing for a maximum shrinking effect and a long lasting adherence.
Rigid Collodion should peel off easily after one day, taking with him the top layer of dead skin (epidermis).
It's not recommended to use the Scarring Liquid several times in a row on the same area, as it will come off with living skin and slightly damage it. It's usually a safe practice to wait three days between applications.