Posted 8 years ago
antiquerose
(1467 items)
Hi CW Gang:
Just wanted to mention a little bit about so called Black Glass. From my understanding there is really no such thing as *Black* glass as it is very Rare. Rather black looking glass is a very, very dark AMETHYST that it looks black.............Or on other words the color is BLACK AMETHYST.
See the Murano bowl here that looks dark black yet see the pic insert as when held to the light -- it is Amethyst
Such as what you see when you hold up to the light. True black glass is rare and most is really very concentrated purple, brown or green. This is how it was explained to me.
See a sample Posted from this CW post of mine of what looks like Black glass, now see the post // pic here:
http://www.collectorsweekly.com/stories/118348-what-started-me-on-a-murano-glass-journe?in=collection-4063
Thanks for LOOKING // LOVING !!
~ Rose ~
Thanks for the explanation - I learned something today! :-)))))
@ Efesgirl ---> LOL, then I HAVE done my job today......LOL
But what about hyalith glass ?It's mostly black because it is black (coloured with manganese compounds)
http://allegro.pl/listing/listing.php?description=1&order=m&string=hialitowe&search_scope=category-26056&bmatch=s0-col-1-4-0613
Not so rare ...
https://www.pinterest.com/search/pins/?q=Black%20Glass&rs=typed&0=Black%7Ctyped&1=Glass%7Ctyped
I don't think black glass is rare at all.
Here are some quotes from another board on the discussion:
"" Most black glass isn't black at all Rose, it's actually very dark purple. Holding up to a strong light source you can see the purple colour, but normally it will look black.'''
"" Amethyst is described as a moderate purple - the same as the gemstone. Black amethyst glass is glass that appears black until you hold it up to the light when it is seen to be actually purple. True black glass is rare and most is really very concentrated purple, brown or green""
"" If it looks purple without holding it up to the light you can describe it as purple or amethyst. If it looks black then that is what it is supposed to be - black. It just has a very high concentration of colorant, purple in this case, so that it looks black""
"" It's most likely purple, which is a deep and rich colour like dark grape juice. Black amethyst is very hard to find - and when you hold it to a strong light (a really strong white light) there is only a tiny glow of purple to be seen."" Glass Author
'' There are three basic types of glass colours - opals, transparents and opalines. What is often confusing is the difference between opals and opalines, because when an opal is blown thin it can appear to be opaline. As an artist I have never got too deep into the science part of this, which I know fascinates a lot of members, but it is to do with how the molecules align themselves as the glass cools and the difference between colloidal and non colloidal colours. I am sure that Adam D could enlighten us much more than I can!
Anyhow, although it hasn't been codified, there is a convention that is used by most colour manufacturers, and therefore many glass makers, that transparent colours are given the names of jewels and gem-stones...I think this dates back to the 18th century when there were very few colours available, and the earlier colours were sapphire (Bristol Blue), emerald, amethyst and in the nineteenth century ruby (Cranberry) Opals and opalines came later and "purple" is definitely an opal colour!
Forgive me if my chronology is out because this is all from memory. To confuse things even further, there is a difference between European and English terminology - I mentioned Bristol Blue, which some people erroneously refer to as cobalt in the UK, because they are more familiar with ceramics! I don't think this was originally referred to as sapphire in the UK but I'm pretty sure that in the middle of Europe, and also at Baccarat, that they called it sapphire.
I'm probably going to get into trouble here, but many of the great colour alchemists have been from what used to be called Bohemia and the main colour manufacturers are still in that region. In recent years, these are Kugler (Freidrich and Schreibler), Reichenbach (effectively Klaus Kugler's second factory), Zimmerman, Ornela, (now part of the Jablonex group but formerly Wiesenthalhutte and then Schott). The recent emergence of Gaffer in New Zealand has begun to challenge the market and also the terminology by effectively negating much of what I've said above!
Anyway, if you asked me for a sample of amethyst, it would definitely be transparent, and if you wanted purple, it would be opal. Different tones of amethyst have different names.. for example blue amethyst or reddish amethyst (amethyst blaulich and amethyst rotlich), aubergine, hyacinth but not purple!""
[ Adam ] http://adamaaronson.com/
Rose is right - true black glass does exist, it is rare. Most glass we see as black is purple, brown or green very strongly coloured.
Great write up by Adam Aronson there.
Thanks karen for also explaining this.
:hugs: xoxo
I experienced the same thing when I received my Charles Lotton "black" bowl Rosie. When I saw it under the light, it had a purplish hue to it. I asked the gallery about it, and they explained basically the same thing, that Charles mixes several colors together which end up appearing black but is actually deep purple or amethyst. It's hard to tell from the photo, but yours might be a V. Nason black and gold piece.
Thank you so ever much Rick for your explanation on this also. Greatly appreciative as always !!
When you have had Charles Lotton Gallery explain/confirm it to you, I take that confirmation from you with very high standards ~ as like Charles work ~ it is very high Standard!! :hugs: xoxo too
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--Ivonne- Thanks Ivonne for the comment and for the link!!
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--Efesgirl-Thanks for the comment! We can always learn something new everyday....LOL
...@Gillian - Thanks for the comment. Discussion is a good thing
...@karen -- Thanks again for your comment and continued Support!!
This truly is a beautiful piece Rose. And the picture....glorious!!
Love all the info too. :)
A very informative read. Thanks.
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Lamplover78 // Trey // Vintageforever // OneGoodFind // gargoylecollector // NevadaBlades // swfinluv1