Rainbow Necklace Trick
Each of the seven colors on the cards has its own number.
Tiny color threads going through all the seven beads in each necklace have their numbers as follows:
Red - 1; Orange - 2; Yellow - 4; Green - 8; Light Blue - 16; Blue - 32 and Violet - 64. They use a binary code.
The colors on the beads are numbered as follows:
Red - 1; Orange - 2; Yellow - 3; Green - 4; Light Blue - 5; Blue - 6 and Violet - 7.
All the colors form a
rainbow spectrum, so this makes them and their order in both sequences
easy to memorize.
When you look at the cards which remain unturned you simply have to
count (as quick as you can) the sum of the colors of threads on these
cards. You always get a two-digit number which says you the two colors
of the chosen bead.
For example, your see that three threads - Orange, Green and Blue lie
opened. They give you 2+8+32=42. This means that the center of the
chosen bead has the 4th color (Green), while its border has the 2nd
To demonstrate this trick smoothly you may want to have some practice,