Thermo-chromic Ink! – Process
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Thermo-chromic Ink, this has been a real favourite over the years, always really effective and gets loads of great feed back, this really does engage the recipient. I think this is best left to your imagination, the only thing to add is the ink is very matt and we have learnt to always use a barrier over this ink, a laminate or a spot UV varnish! this will prevent any unsightly scuff marks.
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