Promotional item that shows a hidden message by heating the sensitive area with your hand.

Thermocolor Postcard

THERMOCOLOR POSTCARD is a fully customizable promotional product in card or postcard size with a black area that becomes transparent with the warmth of the hand showing a hidden image or message. Ideal for original promotions and prize competitions in the telecommunications, food, drinks, tourism, publishing sectors.

THERMOCOLOR allows hidden images and messages to appear with the simple touch of the hand.

A simple but intriguing solution, the warmth of the hand reacts the sensitive area which turns from black to transparent showing what is hidden.

But that's not all because the effect is reversible in fact by removing the hand, the magic area will turn black again covering the hidden image or message.

In great demand to carry out prize competitions with the "warm and win" technique.