Trompe is art that fools the eye and it was used in the creation of this scar. At first glance the scar looks real and bloody, this is just your eye fooling you. Fake blood was used to make the 'scar' look blooding and because less purple was used the scar looks fresh. That is only the effect of less purple! Black was used to add depth but in reality the scar is two dimensional. This is just a different type of art that is more scary.