I have a sibling pair of SA Zoo stock black milks that hatched out Oct of 11. They are pretty much exactly the same size (eating large mice) but the male is already 95% bi-colored... very little yellow. While the female is just starting to develope heaving tipping... up until 6 weeks ago, it didn't look like she would ever turn black. Also, the male never developed any red in the yellow bands, while the female developed tons of red/orange in her yellow bands before they began to darken.

I think black milks are just pretty variable in terms of the speed that they cross over to the dark side.

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