Color Changing Silk-automatic.
Two silk hanks tied end-for-end are caused to change colors as they pass through your fist. Can be repeated until they scream "STOP!"
Two hanks, one red the other blue pass through your hand and change to green and yellow!
Mechanical version, nothing hidden in the hands, no switches, etc. Very simple, even a child of 8 can do it. Great for clowns, MC's and magicians.
Mechanical version; just pull through your hand. 12" model.