What make-up technique was used to preserve Jack Nicholson's grin as the Joker on the original Batman movie? ?

For Jack Nicholson's Joker grin, were prosthetics used? Was his face freeze dried as original rumor has it? What make-up technique was used to preserve Jack Nicholson's grin as the Joker on the original Batman movie? ?
I've never heard that ridiculous rumor.


I'm assuming it was a type of foam glued to his face, then they painted make-up over it. What make-up technique was used to preserve Jack Nicholson's grin as the Joker on the original Batman movie? ?
yeah, i don't think freeze drying is even possible...


it would cause damage to the skin, not to mention hurt like hell...





it would definately be prosthetics and make up.