I am sure that Adam D could enlighten us much more than I can!Īnyhow, 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!įorgive me if my chronology is out because this is all from memory. 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.
What is often confusing is the difference between opals and opalines, because when an opal is blown thin it can appear to be opaline. '' There are three basic types of glass colours - opals, transparents and opalines. 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 "" It's most likely purple, which is a deep and rich colour like dark grape juice. It just has a very high concentration of colorant, purple in this case, so that it looks black"" If it looks black then that is what it is supposed to be - black. "" If it looks purple without holding it up to the light you can describe it as purple or amethyst. True black glass is rare and most is really very concentrated purple, brown or green"" Black amethyst glass is glass that appears black until you hold it up to the light when it is seen to be actually purple. "" Amethyst is described as a moderate purple - the same as the gemstone. Holding up to a strong light source you can see the purple colour, but normally it will look black.''' "" Most black glass isn't black at all Rose, it's actually very dark purple. Here are some quotes from another board on the discussion: I don't think black glass is rare at all. antiquerose, 7 years Efesgirl -> LOL, then I HAVE done my job today.LOLīut what about hyalith glass ?It's mostly black because it is black (coloured with manganese compounds).Thanks for the explanation - I learned something today! :-)))))
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