When I got to the point where all the dye was absorbed, I was disappointed that the yarn wasn't more blue.
So, in one of the pans, I put drops of blue dye straight from the bottle:
It didn't stay spotted, as soon as I baked it for 10 minutes then flipped it over, the spots were gone.
I just kept baking it, checking every 10 minutes until all the due was absorbed (water in the bottom of the pan was clear).
I let it sit out to cool.
As soon as it was cool to the touch I put it in a cool water and vinegar soak:
The extra dye did darken the color. Once both these skeins are dry I will show them off next to each other for comparison.