Farbwechsel Zauberstab (schwarz, Rainbow)

You maintain a dark shade wand in your hand and attempt to do some miracle. Because you need a red color wand to complete it.So you pass your give the wand and presto the miraculous doesn’t occur, it changes in to a red color wand. Because you don’t want the wand to complete magic on it's own you pass your give it again and it changes back to a black wand.You might even spin the wand showing that it's absolutely normal. This is often super easy to complete and repeated a variety of times.Very visible.