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Old 01-26-2019, 01:50 PM
Josh Bernbaum Josh Bernbaum is offline
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Are chrome-containing glasses prone to devit?

Sorry I haven't added anything to this part of the forum in a while, but I'm really glad we now have this section specifically on color chemistry etc. So, I'm just curious if my new hunch might be accurate that chrome-containing glasses might be prone to devit? Here's why I'm asking: I've recently been doing some pieces where the color in the murrini cross-sections I'm using is uncased and 'exposed'. I've done several pieces using the same methods and the first and only-to-that-point devit I'd seen on the surface was in murrini made with one of Gaffer's transparent greens (Lime green they call it). I'm first rolling up a sheet of the murrini slices and making a 'cup' out of it to stuff with more clear glass later in making the final piece. I first noticed the devit on the surface of the cup, just slightly. After reheating and stuffing and making the piece, the devit was slightly more noticeable. So a while later I tried a similar color green made by Reichenbach, R-24. I was a bit surprised to see the same kind of devit. I don't want to case this murrine layer, that might be a solution here but not the kind of look and feel I'm after in these pieces. This is all kind of subtle, but it's there and it sort of makes that section of the piece look etched. I don't totally hate the look but it's not what I intended and I'm mostly just curious what's going on with these transparent greens. I'm guessing both are done on a lead base. One other thing to add which might be contrary to my hunch about the chrome is that I've done one or two murrine pieces made with one of my homemade chrome melts in the past and didn't notice devit. But my chrome content was only about 1-2% if that's a factor at all, and this melt would have been dichromate added to SP batch as the base.
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