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David F.

Wet Vs Dry Measurement

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I have a cone 6 glaze that I've been using for a few years. I would like to see what it is like with some oxides added for different colors. Is there a way to convert ; say 4% R.I. dry to be added to part of the few gallons of base I have wet?

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Not in a very precise manner. The best you can do is estimate how many grams dry are in that wet batch. But with oxides being added in such small percentages, you probably won't be close enough to get very close to an accurate test. Best to do dry tests in 100g or 200g batches.

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I've had the same issue in the past and I estimated that my wet glaze was 50% powder, 50% water when I mixed it so 1 litre of glaze contained 500g powder. I then calculated the 2%, 5%, 8% (for example) of oxides/stains based on that.

 

1000ml liquid glaze = 500g dry ingredients

100ml liquid glaze = 50g dry ingredients. Using 100ml test batches add oxides/stains as follows - 1% = 0.5g. 2% = 1g.

5% = 2.5g. 8% = 4g. At this point I bought some electronic gram scales as the quantities are so small, but I've found them very useful! It isn't an exact science, but you get a pretty good indication from these tests. I write the % with the chemical symbol for the oxide on the back of the test tile so that I don't have to refer back to a notebook for the quantity. I immediately know that this coloured tile was, for example 2% FeO2. Others have a numbering system in a notebook, but it just depend on how you like to work.

 

I have to say I did get into quite a muddle with all the calculations the first time I did this - choose a day when you're feeling sharp and a record everything! Even if you think you'll remember, you almost definitely won't! Every time I go back to do a test batch I have to get my head around the maths again, just to be sure I'm going down the right road. Even as I post this I'm wondering if I've made a glaring mistake in my explanation - it's late here and I should really be getting some sleep!

 

Good luck!

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I have a cone 6 glaze that I've been using for a few years. I would like to see what it is like with some oxides added for different colors. Is there a way to convert ; say 4% R.I. dry to be added to part of the few gallons of base I have wet?

If its a new batch and you know whats in there dry (wieght wise) yes you can do it . If its a bucket that you have no idea about what you have used say already then its a guess at best.

Mark

Joy pots likes this

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and your 5 gallon bucket may not be really 5 gallons.  they have been shrinking over the past few years.  check the bottom.

Like everything, the 1 litre ice cream pots now only contain 900ml. And the price went UP !!

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