hey there,
i know this is a serious newbie question and i used the seach option first but acually i dont really now what i am looking for so please… help 
(i dont even know if its the “alpha” i am talking about …
so when i start sculpting and hit the "apple"button while drawing i get this dark thingy where i cant sculp anymore. so far it makes sense to me. but when i finished working with it how doi make it disappear so that i can work on this area again?
thansk for your help.