ayjay Posted July 7, 2013 Report Share Posted July 7, 2013 I was looking around for some Raku glazes to make up for a forthcoming session and came across a recipe called "Gun Metal" - I've actually found it in two different versions on the net - the proportions are the same in each but neither of them say whether it is by weight or volume - the second version suggests to me that it is by weight. Is anybody familiar with this glaze and able to confirm that? Gerstley Borate . 3 parts Neph Sye ......... 1 part Copper Carb. . .3 parts RiO ...... .... . . 3 parts Gerstley Borate 75 Neph Sye . ....... 25 Copper Carb.. 75 RiO ...... .... ...75 Link to comment Share on other sites More sharing options...
Marcia Selsor Posted July 7, 2013 Report Share Posted July 7, 2013 The first suggests it is by volume. I have a couple of Raku glazes by volume. I would test both ways. Marcia Link to comment Share on other sites More sharing options...
Kohaku Posted July 7, 2013 Report Share Posted July 7, 2013 What Marcia said. Post a picture when you've tested! Link to comment Share on other sites More sharing options...
ayjay Posted July 7, 2013 Author Report Share Posted July 7, 2013 I agree the first suggests it's by volume (but could still be by weight) and is probably how I'll try it first - but the second gives what seems to be an actual amount. How would 75 & 25 (presumably grams or ounces) relate to a volume measurement. ........(or am I just having a senior moment and missing something). Link to comment Share on other sites More sharing options...
Nancy S. Posted July 7, 2013 Report Share Posted July 7, 2013 Seems to me that the 75/25 could be amounts. 75 is 3 parts; 25 is one part. I don't know if this helps at all....and it still doesn't explain whether it's volume or weight. Usually when mixing drinks or baking, it's a volume thing. But with glazes, it's usually a weight thing. And with dry, powdery materials, there can be a big difference between weighing and measuring. That said, I've never seen a glaze recipe with "parts" or proportions like this. Maybe try it both ways (in small amounts) and test it out? Link to comment Share on other sites More sharing options...
Rakuken Posted July 8, 2013 Report Share Posted July 8, 2013 The second recipe I've mixed by weight, 75 grams GB and 25 grams neph sy is OK. But I question the weight of the copper carb and rio, would it be .75? Aloha, Ken Link to comment Share on other sites More sharing options...
TJR Posted July 8, 2013 Report Share Posted July 8, 2013 I am thinking the recipe should be as follows; Ger borate 75 grams Neph Sy 25 grams This totals 100% Then add copper carb 3% R.I.O. 3% In a 100 gram batch the colourants will each be 3 grams. 100 grams of glaze is about a paper cup full when you add water. To make a 5 gallon pail of glaze, you would need 10,000 grams of glaze. A plastic ice-cream pail would be 1000 grams. TJR. Link to comment Share on other sites More sharing options...
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