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Old 05-02-2018, 11:34 AM
Dan Vanantwerp
Posts: n/a
Good points. I used 20 mule borax from the store which is 10M. I performed a molar equivalent calculation to determine the correct amount to add. Derived this little chart for my own quick calculations.

Borax equivalents
5M lb 10M lb
1 1.31
5.2 6.80
9 11.77

Jim doesn't carry lime hydrate and instead used a high purity whitening. I took a cue from your conversion of the unoxidized formula going from lime hydrate to whitening and again performed a molar conversion on the calcium content.

Calcium equivalents
Whitening lb Lime lb
1.35 1
7.42 5.5

The formula doesn't have feldspar...just alumina hydrate.

One of these changes may have caused issues. I worry about the use of whitening but as you were exchanging it in the unoxidized I really wasn't concerned about it. Jordan's point about all rules being off on this type of glass has me questioning everything.
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