So, I have been asked by a few people to post how the Sulfur gene affects the Pastel gene, especially as adults. You have all seen the baby Fire Fly pics, and I am sure my baby Sulfur Pastel pics, so here is my 4 year old adult Sulfur Pastel.
Dave
He is much nicer than either of my adult Pastel females. It seems the normal Pastels brown out on top and you can almost see a line of where they turn brown, and below it where they stay yellowish. The Sulfur Pastel has no line, but brown speckles over yellow.