Vinegaroon as a dye uses the same reaction as when making oak gall ink.

[SUP]

I just realized today, that in earlier times, oak gall ink was made by soaking powdered oak gall in water while also, in a different utensil, soaking old iron nails etc. in Vinegar. Both liquids were then strained separately and mixed to make the ink. No different from the reaction that leatherworkers use to dye leather black with Vinegaroon. I know the same reaction can be used on wood too.

So that is two completely different ways the same reaction was used - as an ink and as a dye. I wonder if there were others.

[Beehive]

Pecan hulls. The discarded shells. Boiled in water with enough shells to infuse the water with a yellowish tea looking tone. 

 

Lots of the fabric dyes of old work. Dying wool yarn. Most are subtle tones of browns, greens, and blue. Most require a mordant.