John Post on sun 5 jun 05
I read the couple of posts about how much water to add to a glaze and
while I agree that the "it depends" answer is true, I do have a starting
point that I use.
For every 1 gram of dry glaze material I add 1ml of water.
A 100 gram batch gets 100ml of water to start with.
I purchased a 1 liter measuring cup at the grocery store. When I mix up
a 10,000 gram batch I just pour in 10 1 liter cups of water into a
bucket to start.
The advantage to having a starting point with water is that when you are
done if everything is ok, you know how much water you need the next
time. If the slurry is too thick, just keep track of how much more
water you add and then jot that down in your glaze notes. If the slurry
is too thin, then next time you make the glaze start with less water.
I typically test glazes with a 300 gram batch size. If I add 300ml of
water and get a good result, then it is simple to get the same results
when I scale things up to the 10000 gram batch size.
Some of my glazes that have more frit, woodash or magnesium carbonate in
them require different amounts of water.
More often than not, the 1ml = 1 gram approach works as good starting point.
Cheers,
John
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