Shock your friends or workmates with this cheeky colour changing mug. Buy it for the work mug cupboard - Karen in HR will be none the wiser until she gives it to an unsuspecting VIP lol.
Looks black until it is filled with hot water
Message revealed will guarantee a laugh!
11oz ceramic mug
Due to the nature of the coatings, the secret message font may be slightly visible when the mug is cold.
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