L'Artisan Pastellier Encre Sympathique Invisible Ink

L'Artisan Pastellier's Encre Sympathique Invisible Ink is ideal for discreet communication. The heat-activated formula, which contains cobalt chloride, remains invisible until heated, revealing a clear blue script. After a few hours, the ink returns to its original invisible state, allowing messages to be kept secret and secure. Perfect for confidential notes or spies!