First I got out all my gear. In the Becel container I have my yarn soaking in Synthrapol to scour it and get it ready for dye.
I have four little eyedroppers that have .25, .5. .75 and 1.0mL markings - that came in very handy. One for each colour meant no mix-ups.
I got an extra plastic cup and started mixing up my yellow, blue, red and brown. Here are all the ratios I used:
Looking at the wet yarn in its wee plastic-wrapped package, I could tell that the yellow had a lot of power. I did several tests without it and I think the one that I (and the wearer of the garment to be knit with said dyed yarn) choose will be one of the non-yellow ones. They turned out more golden brown and that's not a look my manly man is likely to like.
I had to keep the packages numbered to match the notes. Once they're dry, I'll staple them into the book so that the yarn goes with the record.
You can see the strong yellow in some, a more reddy nature to others, and the ones that are the deepest browns seem to be the ones with the most blue.
Now, here's the thing: I didn't measure the amount of dye to the weight of fibre because they were six-inch pieces of yarn and I didn't want to go there. So once we pick the winner, I'll do a proper test of that one using the right amount of dye for the weight of fibre, and see what colour I actually get. I may need to up it from my expected 2% in order to get it closer to the sample, but I can do that, so I'm not too worried. More testing is required, though.
Eventually a sweater will be born.