Perhaps it's a new method of water tracing !
Quote from: braveduck on December 04, 2017, 12:04:07 pmPerhaps it's a new method of water tracing ! Not so strange as it looks like. We use tea bags filled with active coal during dye tracing projects.
Whoever leaves teabags in the flask needs a lesson on how to make decent flask tea!
Suppose that could be the subject of a workshop at the next Hidden Earth.
I've often taken flasks through sumps ........ But I always ensure it's brim full with tea on entry and I refill it to the brim with sump water before submerging again, to prevent collapse.
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