Product details
This is the simple way for moving dot which drawn on the back of spectator card..
The card can be signed by a spectator..
Then, you draw a dot on back of card..
Now, you can make it move to another place, and for the final you can make this vanish from spectator card and the others card..
No special ink!! Instant reset!! Can be examined before and after..
Easy to do, practicable..
