Touch this bookmark and watch it change colour with the warmth of your hand. The warmth of your hand and ambient (room) temperature causes the liquid crystals encased in the bookmark to refract light differently depending on the temperature. Soothing but great fun! Overall size 40mm x 150mm. The Colour Change change can be pale or stronger in shade depending on ambient temperature. The activities appeal to the immediate sensations: warm fingers produce colour changes, rubbing hands together produces heat. See our Store for more colour changing products.

• The warmth of your hand causes a colour change
• Great for relaxation, toy or just a bookmark
• Smart Materials Changing Coating
• Safe, Non-Toxic - Overall size 40mm x 150mm
• Explore the science of liquid crystal