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Old 11-17-2003, 10:52 AM
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Pete VanderLaan Pete VanderLaan is offline
The Old Gaffer
Join Date: Apr 2002
Location: Chocorua New Hampshire
Posts: 22,074
Pete VanderLaan is on a distinguished road
I think you could run your potash up two lbs without messing it up and probably the soda by one lb. That will move the expansion a lot. I don't like to see the modifier falling below 8% but it is still tolerable. The silica content is still comfortably high.That glass makes a very nice manganese purple already. It also will do incredible things with selenium. A beautiful peach glass.

I have never messed with those substitution formulas. They pop up in the Manheim book but I have not had the luxury of those experiments. They are a little vague. I will try them out in the spreadsheet during the class in January.
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