changing identity napkin

This napkin uses a special heat reactive yarn that visualizes a personal fingerprint. It will change its colour in response to heat, resulting in a modification of the identity. By using bamboo yarns, it absorbs 50% more water than cotton therefore the functionality is considerably improved.
 
The napkin comes in either pink or silver and turns white in response to heat. The napkin is 25 x 25 cm and made from 50% cotton, 29% polyvinylidene, 21% bamboo.