Hello again,
I didn't mean to imply that this is a consistent thing, plus one needs to see the right pieces and of course one needs to know to even look for it, since it's not advertized as an "Overlay" like a lot of Fenton's other overlay\cased glass is.
Nobody told me about it, I just have a natural habit\tendency to look very closely at things and inspect the heck out of them, which is the only reason I noticed it.
Here is a vase I dug out of a bin, sorry about the photo quality, it's not my best talent.
http://i29.tinypic.com/29f8sia.jpgIn person I can actually see where one color layer ends and another begins, it doesn't blend\fade from one color to another. I can even catch my fingernail on a slight ridge between the two colors. This may only be the case for items that have the optic? design on the body of the item, since that's where I have seen it, on 6 pieces I have like this. The rest of my plain body pieces look like I expect normal Burmese glass to look, pink inside and out on the areas where it was restruck.
I might be missing something, but I don't see how glass less than an eighth inch thick can be reheated and only one side of it heat up. Hope this helps to explain what I mean. --- Mike