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Item Info:
What? Thermochromic ink on the can of soda drink Cockta (the first commercial non-alcoholic drink in Yugoslavia, produced from 1953).
Where? On the market – Slovenia.
When? Appearing from 2010.
More details: The snowflake becomes clearly visible when its background changes to blue. The colour change occurs within 7-12°C with very narrow histeresis loop (~1.5°C).