Interior house paint can not be mixed in a traditional manner. Most colors are a mix of 3-5 pigments. Even white. So if you try to mix white to lighten up a darker color it won’t work. By doing so you are actually trying to mix 12-15 pigments together. There’s a formula on the back of every color chip that is basically the recipe for that color. So in this case yellow and blue will never make green. I think this type of “chemistry “ is similar to glass. At least that’s where I’m at in this thread. 🔥