I love playing with dyes. Watching a dye-bath go from a deep colour to almost clear as the yarn/fibre slurps it up is deeply satisfying, particularly when I'm playing with multiple colours & sprinkling dye powders.
When I'm trying to get a particular shade of something, be it blue or yellow, red or green ... I suck.
I had this hat pattern in mind, where I needed particular shades of primary colours for the nautical letter flags that adorn it's brim, but attempt after attempt using my precious handspun failed to produce appropriate shades. I have now given up, gone stash diving, & found the right colours in some commercial 8plys. (I knew they were in there all along, I wanted to use my handspun & thought I had the knack. Wrong!)