How to Make Yellow Glass Clear Again
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How-do-you-do
I've had a read through some old posts on here about this topic and am at present more than confused than ever!
Why does some clear drinking glass take a xanthous tinge? Is it a sign of a particular age/location? Completely irrelevant?
Have included photos of two celery jars which seemed to be clear until I photographed when a yellow tint appeared.
Cheers
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It's just the recipe that was used for the glass. Time has moved on, recipes for articulate glass have changed, the consumer expects their colourless drinking glass to be completely colourless, Grey/purple, at present that's a slightly unlike matter
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Interesting betoken. I'm non sure if this has universal validity but a yellowish tinge to me indicates glass that was made in the 1920s. On a market stall of assorted table glass I can observe the items from that menstruation by looking at the color. Now most tabular array drinking glass encountered here is Leerdam or was made in Germany; and it seems in England and in Bohemia there is much more semi-crystal which has a neutral to blue tinge. And annihilation contempo has a singled-out greenish windowpane color while quondam glass is decidedly greyish.
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Holmegaard tableware was fairly bright and clear from the 1900s until around the early on 1940s (possibly slightly earlier), when information technology took on a incomparably yellowed hue. This was truthful until at least the mid/late 1950s. After this it went back to beingness very clear for a period, and in the mid 1970s it acquired a blue-tint in a lot -but not all - of their designs.
And then for Holmegaard glass, information technology's a very useful dating tool, particularly if it's a series that has been in production for several decades.
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Are you sure it isn't merely from the lighting used? When I take a picture I oft take that tinge merely it's just the low-cal bulb. Just my 2¢.
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Janice, Deco Queen
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No the Chance celery at the bottom is definitely yellowish glass - I take one, but that's 50s/60s
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THanks for your input. The pictures are taken with only a daylight lightbulb, and then it's unlikely to be the lighting. I think, if anything, looking at them mornally (with standard lightulbs) makes me more likely to discount any yellow tinge as lighting - and perhaps the contrast between the glass and the very 'white' low-cal of natural daylight just emphasises what was in that location all forth.
So basically (in far too much of a quick summary) - if you lot know roughly where the drinking glass is from, geographically, then the tint tin can help with dating?
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I've heard - and I don't know if this is truthful - that glasses with selenium used equally a decolorant can turn slightly yellowish over time, and that this might have something to do with exposure to dominicus. Information technology would be interesting to compare yellowish vs. greyish glass from the same company to see how each fluoresces under UV.
As far every bit using glass tinge for dating, my feeling is that there is some limited use, just one has to be very careful and it might non become by geographic origins alone; it may be company-specific, likewise.
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Kristi
"The about beautiful thing we tin can experience is the mysterious. It is the source of all true art and all science."
- Albert Einstein
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A lot of Sowerbys' "colourless" glass develops a distinct yellow tint when exposed to sunlight, specially that made in the 1940s and 1950s. Arsenic was used in the mixture both as an help to decolourising with selenium and cobalt and as an aid to speed up melting and hence to increment production. The latter effect needed many times more arsenic than the former. It was only afterwards some years that nosotros noticed the horrible colour effect which was put down to using far too much arsenic. To this day I cringe and feel guilty when I see this, mainly at boot sales. For the record, merely in example anyone has access to a suitable kiln, if the article is re-annealed, the outcome disappears. A sideline for someone, Adam A?
No uncertainty other manufacturers fell into the same trap.
Adam D.
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No, I don't think yous tin utilise a yellow tinge for definitive dating in general. I have a commemorative paperweight that was certainly engraved in 1995 from a bare that was probably made at the St Helen's Ravenhead glassworks (information technology was produced for the regeneration project in the Ravenhead expanse) that is definitely yellowish. You can probably say of decorative and tableware that if it's xanthous, information technology may older rather than newer. So you take to apply other dating criteria such every bit fashion and clothing.
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