the tea lightens
Green
Because Vinegar is an acid, the litmus paper would turn red
it turns blue litmus paper red
Red, below pH 3.1
If the vinegar is strong enough to be below 4.5 pH the litmus paper will turn (or stay) red.
It turns greenLOL
To turn green black, add black.
it turns red
green
Vinegar is an acid (acetic acid). It will oxidize metals (causing them to rust)...which can look black.
black
it turns into fushia/purpley colour