I tried matching the colors on new factory annealed cases and found it difficult. I took a color blindness test and the result labeled me "extreme deutan" the report said that I see peanut butter as green and I said "Yeah, isn't green" also said I see green light as white, always wondered why they were called green lights. My brother took a color blindness test when he was in grade school and he was extremely color blind turns out I am worse than him, just did not know it.
So the colors the rest of you see when annealing may not be what I see.
A fast fool proof way to anneal case necks is welcome to me.