Color Changing Fire Box by R.O. Magic Germany: distributed in the U.S. by Viking

This is a wonderfully made prop. Never used. The box is a fire box but also changes color.  Show a black box and drop a red silk through the fire lit box and the box itself changes to red as the silk emerges unharmed. The box is 4.5×4.5×4 inches. No longer available. With original instructions.