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What is the tooth tap, dear fossil?
If you tap unknown object on your tooth, you can discern stone, pottery, clay, metal, plastic, etc etc, without ingesting possibly contaminated soils so close to your bloodstream.
Even the tooth tap is still no longer recommended. Both my undergrad and grad schools refused to teach/allow students to put anything in our mouths due to risks of contaminated soil.
User caution of course. Not exactly my first point of call on an urban site haha.
And I get weird looks for spitting into my hand to texture soil...
Why? Giving soil the ol' hawk tua is way faster than digging out a water bottle from the pack.
You're a man (or woman?) of culture, I see. Precisely why I did it that way for years. I eventually got a camel back, and that worked pretty good - squirt a couple drops of water from the mouth piece on the soil and away you go.
It's how you do it!!
This just brought me flash-backs of the absolute nut-bar I used to play DnD with that would tap dice on her teeth before rolling them "to check if they were real."
This is the closest thing to context I may ever have to that experience. I thought she was checking real vs imaginary, maybe she was checking if they were... ummm.. real bones? wait. no.