Answer : Sex in leopard geckos is determined within the first 3 weeks of incubation. So if you let albino eggs experience 78-83F for 22 days that will lock in the female sex and then you merely move those female eggs to a constant 90F for the remainder of incubation to get the best looking possible female offspring.
Answer : The good news is.....absolutely. Just follow the steps outlined above.
Answer : Yes. I have tested this on geckos from 1 to 12 months old. Those given a hot spot of 90F all the time don't darken compared to geckos that have been exposed to temps below 84F. This darkening does not reverse itself.
Answer : Temperature. These are the result of incubating eggs at 84-86F.
Answer : Yes. Viets' paper proved that for high yellow banded leopards. I have found this to be true to some degree for the tangerine phases also.
Answer : Not until they hatch.
Answer : The color pigments will migrate and the young will be then hatch much darker in color. I even tested this 2 days before hatching at a constant 90F and got noticeably darker albinos.
Answer : No, it's just the reverse. The geckos incubated at 90F are actually showing us the true potential of the genetic cross of each breeding while the dark pigments are creating an artificial "mask", which prevents us from visualizing the genetic potential at hand.
Answer : To my knowledge, there is no evidence of this.