reading a color on a test

I was just reading a thread on another forum of color blind people on how to read the color on a test kit. A person came up with a pretty smart idea for how to read them. I haven't personally tried it yet but I bet it works. There is a app apple and others both have it. It's called color identifier. Do the test as usual. The app works with the camera and will tell you what color something is. So do the test put the camera on the test tube then on the color card. Which ever one it says the same name for both is the number your looking for. It uses some weird names but green isn't just green it reads all the different shades differently.