This test is based on the idea that different dye colors stick to yarn at different rates. Here, I used black McCormick food dye which is made up of red, blue, and yellow primary dye colors mixed together. I put the black dye into a pot with some vinegar, then put an entire skein in there for a few minutes. Then pulled out 1/5 of the yarn, waited a little longer, pulled out another segment of yarn, etc.
This left the yarn various shades of maroon, which was not my favorite, so I overdyed the whole thing with some blue, which got me these browns, blacks, and gray colors - much nicer. The yarn I used here was recycled from the wheat colored Polo R.L. sweater a few posts back.
