Okay, so yesterday there was red cabbage at Kroger. I bought a head for dyeing. I read up on how non-colorfast it is. I fretted some. But I’d already bought it, so… I mean, this is a long-term project. If the colors start to do something funky before my dyeing is done, I’ll just redye.
I split the dye bath into three and made one acidic, left one neutral, and made one basic.
There they are. The pink is the acid, the purple the neutral, the bluish-gray is the base. That makes sense to me.
But, as I picked them up out of the water, they began to turn colors. The blue became a weird mint green. The purple became a Band-aid pink. The pink became… and I’m not even shitting you… yellow.
Note, this photo makes the Band-aid color look almost like a pretty pink. It was not in real life. I ended up throwing it in what was left of the basic bath to turn it greenish.
Why did this happen?! Could it be something in the acrylic yarn I used to tie the skeins? Something having to do with the pots? I washed them, but the yellow was in the pot I used for tumeric.
Also, I am a mix of delighted and chagrined that I am some kind of “dyeing things yellow” savant.
I’m going to have to pick a pattern that works with these colors and also takes into account that many of them will fade. Or possibly change color over time. It needs to look good with these colors and look good with the antique versions of these colors.
Tiny Cat Pants 
Your mention of turmeric reminded me that you can dye with it. And also with saffron (expensive) and henna (not expensive).