My grandpa worked in a print shop and said they used to check ink thickness by rubbing it between their fingers, then licking them clean. He swore he could tell the mix of oils just by the taste. It's wild how much hands-on stuff got replaced by machines. Makes me wonder if those guys actually had better instincts about their work than we do now with all our digital readouts. They were basically using their whole bodies as tools.
Honestly, that sounds gross but maybe not the worst. People used to test for diabetes by tasting urine for sweetness. A lot of old methods were just using what they had. Bet the silt guys got used to it and called it a day. Makes you wonder what we do now that will seem nuts in a hundred years.