A lot of the glass made in the west by Western Flint Glass does fluoresce, and I assume you are correct in thstat is is uranium glass, although I do not know for sure.
In recent relatively years, there have been commemoratives and special issue insulators made just for collectors (compare to the CCF family coins of this forum) of uranium glass just for this purpose.
As to colors:
1. Only the Hemingray factory made special colors to order. These were to aid the linemen from "Company A" to ID which wires were "Company A's" wires on lines where "Company A" and "Company B" had their systems set up. "Company A" might choose cobalt blue while "Company B" chose amber.
2. Purples were all made as clear - but he manganese, used for the purpose of producing clear glass form the melted batch, turned purple in the sun's UV rays (glad it did!)
3. Most colors were accidental in that melted glass cullet was used to aid in melting the sand used to make the glass. From what I understand making glass from sand is a lot more difficult without previous glass being used as a catalyst.
4. Mostly it is colors that draw people to these (who doesn't like the look of a window of colored glass?), but some clear ones are very rare and valued as much (if not more). Compare this to the eye appeal of a coin - we like either toned or blast white depending on our preferences, but an 1800 silver dollar in AG is valuable b/c of rarity.
5. The best thing s that like coins, these have eye appeal and history to make them desirable.
I have posted this on another thread, but here is a look at some of what I see when the sun comes up each day.


There is a price guide, like in coins. And values depend on what people like and for what reasons they like them. Like coins, people start out collecting everything and then settle into specialties.
The insulator hobby - although much, much smaller than the coin hobby -
is like a large family - just like here on CCF. One of the largest shows is coming up in Springfiled OH starting this next thursday night and going through Sunday, and I am looking forward to it b/c of the family reunion atmosphere.
I know others on this forum, after other posts, have enjoyed looking at insulators.info - specifically browsing the picture gallery link that can be found there.
NIA.org also has a link that has a picture of one of each profile (known as a "Colnsolidated Design - or CD - and assigned their own CD number) to make identification easier. As to values, the price guide link is also on insulators.info, but perusal of the picture gallery by searching for a CD can help determining value.
B/c the hobby is not as well known as others, I can honestly say everyone I know who is active in the insulator hobby has made a first rare find in antique shops, garage sales, flea markets etc. within the first 5 years of being in the hobby.
Also, and the area I like, a lot of the research in specialty areas is still open to those who like a good challenge/mystery.
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