Jinn

Pink "algae" is indeed Methylobacterium mesophilicum. However, unless you can feel it on the head itself, its unlikely thats what it is. Is it possible that (1) Its actually a color changing head on the packaging and he didnt notice or (2) It's cheap plastic/composite that has a color-changing effect with heat? Some polycarbonates/plastic composites will change composition and color when you apply heat like color changing plastic mugs. If you've ever put the wrong kind of plastic in a dishwasher you can see this too...

..Just my two cents.

JiNN

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