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Author Topic: Black Glass  (Read 5553 times)

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Offline Ivo

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Black Glass
« Reply #30 on: July 17, 2006, 07:15:38 AM »
Quote from: "Lustrousstone"
And the next question is do we know what colours hyalith? Iron = brown black, manganese = purple black, green black = ? and hyalith =??

Various admixtures such as basalt, according to the Egermann Crystalex book, produced the radiant black colour of the dark and infinite night skies.

Offline Adam

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  • Sowerby 1949-56, Davidson 1956-61, Jobling 1961-72
Black Glass
« Reply #31 on: July 17, 2006, 09:41:02 AM »
I'm very suspicious of the 'perfect black' concept.  If any owners just happen to break a piece, try looking through any of the fine slivers.  Better still, get someone to grind down a thin section and see what colour can be seen through it.

Adam D.


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Black Glass
« Reply #32 on: July 17, 2006, 09:52:41 AM »
That is my point exactly, Adam D.

This is becoming rather academic, but ..... :lol:

In simplified terms the color of an object is determined by the interaction of light waves and the individual's eyes who is viewing it.  By definition black is the total absorption/adsorption of light waves.  Therefore if light can penetrate through a piece of glass, then it can not appear black to the human eye.

I did hold up the light to  my black Fenton Big Cookie Jar. It showed a deep purple.  But the body of the jar is too thick for light to penetrate and it appears solid opaque black.  Together resting on the shelf they both appear to be an opaque black just like the other black Fenton pieces I have on my website. They were all made from the same forumation of black glass.


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