Thermochromic
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Thermochromic ink changes color or becomes colorless when the temperature is changed. Samples are only available for first time customers who would like to trial ink before making the minimum 4lb purchase.
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Photochromic
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Photochromic ink is invisible until brought into contact with UV light, like sunlight.
Samples are only available for first time customers who would like to trial ink before making the minimum 4lb purchase.
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