I'm more color mixup than blind. For me shades of red or green can look brown, or brown can look blue or red or green. Apparently I almost flunked coloring in the 2nd grade according to my mother. :) So, I chuckle when my wife asks what color would go with another color.
I'm trying to figure out what's wrong with my soil, so yesterday, I thought well, I can figure out the PH for nothing, so I boiled some red cabbage, and poured the juice on a soil sample. It turned from purple to blue green, or something between purple and purple green, but kind of brownish. I thought for sure it had to be acid, but the chemistry indicates the soil is alkaline.
I emailed Drew_2017, and told him I thought I would have acidic soil, but it's alkaline, but Drew said, "It's more logical to believe it's acidic, because grass will grow better if it's slightly acidic.
But how alkaline? I feel like identifying blue green is the outer limits of my ability. When the purple turns pink, I can see that just fine, but I'm on the other side of the scale. Finally, I ordered a kit from Amazon, for some lab in Spokane Washington. You send in samples, and they do a chemical analysis and email the results, with actual numbers you can calculate from. Plus they test for other nutrients as well. Cost: $24
But as Drew points out, the trouble with scientific labs is that if you don't like the lab results, they won't change them for you. It's better to just believe what you want.
Does anyone need any cabbage juice? I've got some left over, although it's starting to get a funny smell.