Pondering tannin in my backyard. Tannin gives natural dyed pieces light fastness. I’ve done tests with ferrous sulfates and have found that white ash turns nice and black with an application of ferrous sulfate. Just like Gall nut. So, that’s a confirmation of tannin. Honey suckle didn’t go as nicely black. Black walnut turns to a lovely black.
All four take on varying shades of color when they are dipped in aluminum acetate. Black walnut turns a lovely almost golden yellow…nice, but it would interfere with the dyed color. White ash turns a bit yellow. Honey suckle goes deep yellow…but it doesn’t seem to have much tannin. Gall nut is a bit tan…nice (non) color.
The whole reason to test for tannin is to get some light fastness. So, now, I’m testing for that. I started with the tannin dip. Then dipped in alum acetate. Then I dyed them in cochineal. I’ve clipped off “control” pieces. The rest will hang in the sun and periodically I’ll compare them to the control pieces.
Don’t know how the test will turn out…but today they are like lovely shades of sherbet!! It’s SOOOO hot today that sherbet is extra attractive!!