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Wet Vs Dry Measurement


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#1 David F.

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Posted 19 August 2014 - 03:05 PM

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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#2 neilestrick

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Posted 19 August 2014 - 03:09 PM

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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#3 Celia UK

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Posted 19 August 2014 - 05:33 PM

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!

#4 Mark C.

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Posted 19 August 2014 - 07:46 PM

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


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#5 David F.

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Posted 20 August 2014 - 02:45 PM

I guess I'll mix a test batch as I don't know how much dry weight is left in the bucket now. 

Mark; I can't believe you don't have a formula for "8 inches left in a five gallon bucket=..." :rolleyes:


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#6 Mark C.

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Posted 20 August 2014 - 02:49 PM

(Mark; I can't believe you don't have a formula for "8 inches left in a five gallon bucket=.)

 

I do have a formula its called I need to make another bucket of glaze as I only have 8 inches worth.

Mark


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#7 oldlady

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Posted 20 August 2014 - 06:22 PM

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


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#8 Chilly

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Posted 21 August 2014 - 05:50 PM

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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#9 Babs

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Posted 21 August 2014 - 07:17 PM

Read the labels, and make sure your labels do not drop off or fade!!

Help I think I am shrinking too.



#10 oldlady

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Posted 21 August 2014 - 10:39 PM

the incredible shrinking woman was a movie in the 60s, 70s?  


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