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These Heat Sensitive Hypercolours really make their mark!
Hypercolour Thinking Putty is thermochromic -- just a touch from your hands or a warm coffee mug will reveal a new "hot" colour. Allow it to cool off or stick it in the fridge! Then the "cool" colour will be restored.
Made in the USA!
Each metal tin is hand packed with 90g of Thinking Putty, much more than you get in a plastic egg!