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Old 08-06-2017, 04:09 PM
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Pete VanderLaan Pete VanderLaan is offline
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Join Date: Apr 2002
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you did get them from glassnotes 3rd. Croucher established the corrected factor based in Appen which bears out in a physical measurement, which is how it was done in the first place. You'll find it in Glassnotes 4th.

What you won't find in the 4rh is the factors for metallic oxides. They're simply hopelessly totally wrong and are based in a completely different temperature range in a study done for the enamelling industry back around 1925. Paul Manners put those factors in an article he wrote for Glass Magazine called "custom made to Fit" in or around 1977. That was the first error. Then, Henry canonized it putting it into the 3rd edition.

I suggested that he remove it based on the evidence, and he did.

There simply are no factors for the colorants and never have been.
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