Identifying U.V. Glass?

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SGF, Supreme Grumble Framer
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Identifying U.V. Glass?

I'm sure its been talked about before, but I'm lazy and everything has been talked about before.

So, this client comes in with some perfectly framed posters in metal frames and says she would like to put wood frames on them and u.v. glass on one of them, because she recently framed one of them and was sure she had it framed with u.v..

I can identify True Vue by scratching it near the edge, so I took it apart to give it the scratch test. No scratch and no label. I didn't want to argue whether or not it was u.v., so I'll just give her a new piece for free, and label it.

So, my question is, does all u.v. protective glass have a coating that can be scratched?

[ 09-20-2003, 01:05 PM: Message edited by: lessafinger ]
 
I just got one in yesterday to match the moulding. It came from JoAnn's and has a UV label. In holding the frame up with the light reflecting on the glass, you can see tiny little "wiggles" or waves in the glass, just as you can when the uv glass is out of the frame.

The scratch or beaded up cleaner/marker test is for when you already know it's uv and need to know the right from the wrong side.

As for all brands scratching, I don't know.

Betty

[ 09-20-2003, 01:15 PM: Message edited by: B. Newman ]
 
I would work under the assumption that the UV, being an applied product to the glass, is scratch-able, regardLess of manufacturer. I got to play with some lites of the Guardian product at the Atlanta show, and they could be scratched. I have not had hand-on experience with the denglas UV, but since Denton Vacuum Technologies is in the "coatings" business...

Besides the "orange-peel" effect on the Tru Vue UV products, I can also identify the conservation series (not waterwhite) products by the color of the edge of the glass. Put a piece of regular next to a piece of UV and see if you can't tell the difference. The lack of the Tru Vue printing along the edge is not necessarily indicative of anything. I often remove that printing to avoid having it seen in the frame.

I would think that you could also do a simple test for those products that you are unsure with the aid of a UV light source. Conservation supply houses sell UV lamps used to detect repair work on paper and canvas-borne art. Get out all those old Day-Glo posters and see if they react under the glass in question when illuminated with the UV light.
 
Like Wally said, I keep one of those inexpensive, battery operated "black lights" from Edmund Scientific (less than $20) around to test glass without taking things apart. Many papers have brighteners added, so white portions really glow if regular glass is used and hardly anything happens if UV glass is over the piece.

At least some customers are impressed when you show them the white glow, even through the glass and then slide a small piece of UV glass over the top and watch the glow disappear.

[ 09-20-2003, 08:05 PM: Message edited by: Rick Bergeron - CPF ]
 
I am so accustomed to using Cons glass that putting the True-Vue label on the dustcover has become a reflex action.

I am pretty sure I've done that with a least one lacquered studio photo framed WITHOUT GLASS!

If I could remember who it was, I'd issue a product recall. 26 years of credibility down the toilet. :rolleyes:
 
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