Colour Change Heart Stickers

10 Liquid Crystal Colour Change Heart Stickers Touch these black stickers or stick on a warm surface and they change colour These liquid crystal hearts are so sensitive that it can detect the heat print your fingers leaves behind! Touching these black plastic hearts create a beautiful thermal print, or place the black stickers onto a warm surface between 25C - 30C and watch them change colour.  Each colour represents a different temperature. The colour change is reversible - wait a few seconds and the colour changes back. Approximate Dimensions: 1.8cms x 1.7cms Exact colours can not be reproduced. Image not to scale. Great addition to your sticker collection, crafts or cardmaking, stress testing, make stress cards, or stick on schoolbags or mobile phones.  Use for science projects, or just about anything. Instructions for useThe self adhesive hearts are supplied pre-cut, on a backing sheet - just press them out. This is a thermal image of a handprint on large Liquid Crystal Sheet. These large Liquid Crystal sheets are used for school or laboratory science projects.  There are many applications for liquid crystal sheeting, including Medical Thermography; Non-Destructive Testing/Thermal Mapping or just for fun.