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BREW SOME BLACK OR GREEN TEA
COMPOUNDS CALLED TANNINS, FOUND IN TEA, WERE HISTORICALLY USED TO MAKE INK
make a drawing with your tea!
the drawing is revealed!
THE TANNIN CONTAINS A COMPOUND CALLED GALLIC ACID
ON STANDING, THE COMPLEX BECOMES DARKER AND INSOLUBLE, PRODUCING A PERMANENT INK
Here's the scheme for the two-step reaction
How about iron gall ink for chinese calligraphy?
Besides Fe** ions, tannins can also bind to metal ions such as Cu