Continuing my dyeing experiments, I visited my beloved local Trader Joe's on Monday night, where I purchased 2 bags of frozen berries. Here are the results of mixing half a bag of frozen blueberries and a bit of vinegar.
More precisely, I let the berries boil in water, added the fabric and some vinegar as mordant, then let the whole mix simmer for an hour (with a lid on!). I let the fabric sit in the blueberry mush overnight, and removed it the following morning. I gently washed the fabric to remove any excess dye, and ironed it to heat set the dye. Above is the result.
While this fabric has a pinkish cast, I can still see the blue origins in the color. It is definitely darker than the purple onion skin. I'm having so much fun with this project!