| Original Message: Re: Re: Glass chemistry question |
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Thanks Art for all explanations in the making of the coloring materials.
We have in our Museum a few samples of these muddy colors. It is hard to qualify them either as blue or green chevrons.
In the pictures it seems that in the last layer the green has sunk below the blue as if being colors glass of different density. When looking at a bright light the beads look greenish, when looking in the shade they are more bluish.
The overall effect is a kind of muddy blush green. I guess it is why they are described as teal to differentiate them from the regular blue and green ones.
I do agree that the 7 layer chevrons were not a refined product from Venice, cheaply made with no material or precision or artistic requirement. It was one of the ingenious products made and aimed to facilitate trade for the European expansion in the third world of that time.
Looking at all 7 layers, you might suspect that a bunch of them could have been part of training or testing skill for apprentices in the glassware industry.
Because of their numerous variations and their crude appearance they have created an interest and the magic is that today they are revered and coveted by many collectors. They are a genuine and intriguing relic of their time.
JP
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