Herbert von der Linden was a magic dealer in Germany, his most famous releases were the Ganga & Milk Wonder Perfect.
Colorette utilizes a old mentalism principle to bring about a fascinating parlor trick.
Three balls of different colors are resting on a wooden board. A spectator mentally selects one of the three balls but does not name it until the end of the routine. The performer now turns his back to the board. The spectator is now instructed to mix up the balls on the board. This is done in several steps. When he is satisfied to have mixed the balls thoroughly the magician turns around and immediately is able to name the correct color.
This can be repeated as often as wanted with different outcomes.
The original German instructions are included as well as English instructions.