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When Glass lost its colour
For thousands of centuries after sand was fired into glass objects in the Near East around 2500 8.C. This now commonly clear material was usually produced only in color. Inpurities lent colour to glass, and a workable decolorization process had yet to be invented. By the end of the thirteenth century, the technique of adding clarifying substancesto make glass clear was perfected in Venice which had become, and to this day remains, a world center for exquisite glass production.
One way Venetian glass manufacturers retained their monopoly on certain glass making processes was to move in 1291 to an isolated island wher materials were hoarded, techniques kept secret and penalties assessed on trespassers and talkative employees.
To infuse glass with colour irnpurities can still be useful. Here are some common cornpounds added to glass to produce popular colors:
Blue Cobalt and copper
Bottle Green Oxidized iron
Brown Iron and sulfur
Purple Chromates
Red Copper or selenium
Ruby Gold
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Contributor's Note
This intel reflects only one of my activities. I also write about and/or have websites on Vespa Scooters, Lambretta Scooters, Hardy Banana plants, Medical memorabilia, reborn baby dolls and much more. Hope you enjoyed the read, Philip Davey
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The copyright for this content entitled "When Glass lost its colour" has been specified by the contributor as:
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This content may not be copied, distributed or adapted by anyone under any circumstances.
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This intel was contributed by Phildave
Phildave
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May, 2012
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