It is possible to decapitate using this trick.
French performers Michelle and Ernest Ostrowsky developed an act called "Omar Pasha", which uses a magical technique called "black art", which does not refer to them being in league with the devil, but whose name explains how it’s done: bright colors show up on stage, and anything covered in black disappears.
Omar Pasha is an animated look at something "Foreign" come to life, like a children’s book or manuscript where another culture presents you with different rules that defy the conventional.
Omar Pasha – Amazing Act
The next video is mostly the same act, but the beginning is different – I like how he "paints" the objects, and I especially enjoy the bit with the candles. Please ignore the introduction, if you can.