Pepto Bismol is a distinctive pink hue so recognizable it is referred to as "Pepto Bismol Pink". The colour is a result of the main ingredient, bismuth subsalicylate, AKA pink bismuth.
This is the same ingredient that turns your tongue black. Pink bismuth reacts with the tiny amounts of sulfur in your saliva and forms bismuth sulfide, which is black, and it can coat your tongue after you take it orally.
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