When I was right out of high school I worked at a paint store....Sherwin-Williams....and custom mixed colors. People would bring in a painted piece of wood or whatever and I'd be tasked with matching that color. These videos remind me of those days. In grade school we're taught the primary colors and how mixing those will give us the greens, oranges, etc . Working with colors in that paint store was certainly a departure from the basic colors. lol
Now as I'm much older and computers are in charge of doing things I can see where people get frustrated with color matching. Trying to match a color using real plastic and comparing it to a color on a monitor is tough at best. No two monitors will show the same color exactly the same. The best way to color match is to have great lighting [daylight or daylight bulbs], where there are no shadows, first, and then have an actual piece of the original color in your mitts. Shadowing can change a person's perception of a color in a heartbeat.
The beauty of plastic is that one can get really close in color fairly easy and that's usually good enough. This avocado color is one that shows how going in a direction with colorants that's completely against common thought will get you to where you need to go.