I’ve started boiling eggs again after a long time.  I’m simply adding the eggs, bringing to a hard boil then light boil for 10 minutes. I notice the outside of the egg yolk turns grey. The outside of the white part feels like there’s a film on it but and it’s not as soft as the inner white part.  Does this grey tint mean its overcooked and is it possible to boil eggs such that the egg yolk surface will always be yellow? Is it possible to get the surface of the white part as soft as the inner white part?  Thanks
I find I always have trouble scaling the amount of time the eggs should be boiled, cooled, etc. for different-sized batches of hard-boiled eggs.  I've heard a variety of "folk lore"-type rules for how it should be done, but what's really the right way?
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