Well, perhaps it's the copious slag swirls of genuine red and clear and a base marie of powder blue and red slag. I have sent photos of this piece to long term collectors all over the world and the comments have always been the same, in 30, 40, 50 years of collecting and conventions they may have seen one or two pieces with a similar effect, though nowhere near as striking. Yes, it is genuine red.
Not amber, or purple or some other kind of optical illusion. I can guarantee that because you can see that the slag swirls and only the swag swirls glow a yellow-orange under UV light (Photos 6, 7 and 8). If you have ever seen a UV light waved over Red or Amberina carnival glass you will know that the'unstruck' cadmium colourant glows from a pale yellow to deep red.Please refer to the great Thistlewood site for more information There's no Gold in my glass! There is also a pale green glow, which I believe is from the colourant used in the powder blue.
After consultation with learned collectors with much greater experience than me, the general consensus is that this piece is a true end of day workers whimsy. At the end of a days production, there may have been a tiny amount of red, blue and crystal (for marigold/white) glass melt left in their respective pots. A worker would have grabbed a smaller mould such as the Open Edge Hat, and mixed all three colours in together. Perhaps he was feeling patriotic or maybe even it was a whimsy for Independence Day?
We'll never quite know the reasoning but we do know the result. If you have any questions, please feel free to ask and I'll help you if I possibly can. The item "Red White and Blue Slag Carnival Glass Fenton Open Edge End of Day WHIMSY" is in sale since Tuesday, April 12, 2016. This item is in the category "Pottery & Glass\Glass\Glassware\Carnival Glass\Vintage (Pre-1940)\Fenton". The seller is "morant_and_sons" and is located in Kingston Se, SA.
This item can be shipped worldwide.