The way my equation should work is:
You take out the first 4ml (could be any known amount) out each cup for two tiles and weigh the liquid glaze left in a cup. Put that through the equation and get total dry glaze in the cup. Mix up the 80ml of 40 x 1% oxide and add 2ml to each cup.
Run another grid, put the new weight of liquid glaze and ml through and mix up a new solution of 80ml to add into cups. I think you should take off any extra oxide you have already added to give a better estimate of total dry base glaze.
This way I think as long as you take out measured amounts each time you can quickly calculate dry weight.
- Joseph F likes this