Pick up a spa treatment voucher from the high street cosmetics retailer Lush in store or online and you’ll notice something special: a fantasia of tiny liquid crystals that react to the heat of your skin and blossom into stunning colour.

This magical effect is down to the use of a design incorporating Thermochromic Ink from LCR Hallcrest; a material that reacts to changes in temperature to produce vivid patterns which then fade as the paper cools.

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