Sugar High by Chris Randall

A spectator is handed a sugar packet from the table and asked to hold on to it. A box of crayons are introduced and the spectator is asked to select a color. For our example, the spectator chooses green. A green crayon is taken out of the box and is waved over the sugar packet till it changes to a white crayon. The sugar packet is then torn open and when the sugar is poured out, it's now green sugar.