Bethw13 Posted October 14, 2014 Report Share Posted October 14, 2014 At a recent glaze making seminar John Britt said "everything MATTERS!!" I wrote it down and underlined it with a nice yellow high lighter. Yesterday I was figuring out the amount of oxides and colorants for glazes. I was doing it wrong. I asked my husband who knows ALMOST everything, the guy is brilliant and he was doing it wrong! My phone knows how to do it. I've been having trouble with glazes forever because I didn't figure out percentages correctly. I put way too much colorants in them. Use your calculator and make sure you are doing things right. I didn't do it wrong all the time but a lot of the time. Can't wait until the next glaze load is fired. Soon.B Link to comment Share on other sites More sharing options...
High Bridge Pottery Posted October 15, 2014 Report Share Posted October 15, 2014 I thought that base glazes added up to 100 so 1% is 1 Link to comment Share on other sites More sharing options...
Colby Charpentier Posted October 15, 2014 Report Share Posted October 15, 2014 I thought that base glazes added up to 100 so 1% is 1 All glazes should be normalized for ease of use Link to comment Share on other sites More sharing options...
Bethw13 Posted October 15, 2014 Author Report Share Posted October 15, 2014 I thought that base glazes added up to 100 so 1% is 1 Yes that is true. But remember those pesky decimals? .05 percent? Stuff like that. Now I multiply .05 % times 5000 with a calculator and no longer mess that up. I think there is an order of operations in there... Link to comment Share on other sites More sharing options...
neilestrick Posted October 15, 2014 Report Share Posted October 15, 2014 To convert percentages to decimals, move the decimal point two places to the left. So 1% becomes .01, 10 percent becomes .10, 0.5% becomes .005. Then multiply by your batch size. The problem for many people is that there are tons of recipes on the internet that someone has posted in their batch size, like 2758 grams or some other number that means nothing to anyone else. So then you have to convert it to 100% before you can do anything with it. But you need to leave out the coloring oxides when you do that, so that you have a nice base glaze that can be used with other colorants. Glaze formulation software (I use Hyperglaze, but there are others that work just as well) comes in very handy for these situations since it will convert recipes to 100% and calculate batch sizes for you. Link to comment Share on other sites More sharing options...
Pres Posted October 15, 2014 Report Share Posted October 15, 2014 Glaze software is great for working these problems out if you don't invest in one then a good spread sheet will do much the same if you are able to work with them. By the time you have all of the look up tables done, with all over your ingredients, you might as well have the software. Link to comment Share on other sites More sharing options...
Babs Posted October 15, 2014 Report Share Posted October 15, 2014 1% =1 divided by 100 as Neil stated. 0.01 so if it's 3% of 1000gm/kg etc =3/100x1000=30gms/kg etc Do it for your glaze and note it down in that glaze notebook! Don't drop it in your glaze bucket, everything matters but some matter more than others. In fact I'd be testing the base glaze prior to adding the colourants as these can be the more expensive items in your glaze. Get your cobalt wrong mega cents worth and a pretty putrid blue Link to comment Share on other sites More sharing options...
High Bridge Pottery Posted October 15, 2014 Report Share Posted October 15, 2014 Even when the batch size is strange I still look at it as 100% so 100% = 2758, Y% = (2758/100) x Y Link to comment Share on other sites More sharing options...
neilestrick Posted October 15, 2014 Report Share Posted October 15, 2014 Even when the batch size is strange I still look at it as 100% so 100% = 2758, Y% = (2758/100) x Y Yes, but it's difficult to look at a batch of 2758 and tell quickly what percentage of colorant is in there. Going to 100 gives you a basis of comparison to other glazes. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.