Explain Like I'm Five | Don't Panic!

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The original was posted on /r/explainlikeimfive by /u/buntypieface on 2023-06-26 08:08:30+00:00.

ELI5: - how does my purple shower gel and my blue shampoo not colour my skin the same colour as it has been designed to look? It's a colorant, a pigment isn't it? How the hell does it just turn to soapy goodness without leaving me the colour of a Smurf?