synj00 Posted April 30, 2014 Report Share Posted April 30, 2014 Out of the hundreds of ingredients that can make up a glaze what is the most interesting to YOU? It could be one that just gives interesting results when firing methods change or something that gives a good feel or texture to a glaze. I found a recent article by Matt Fiske talking about Manganese Dioxide which is very interesting in giving the iridescent shine and interesting colors to a glaze. Sebastian Link to comment Share on other sites More sharing options...
Tyler Miller Posted April 30, 2014 Report Share Posted April 30, 2014 The Iron oxides. I don't think any other ingredient can create as many variations as oxidized iron. Reds, greens, blues, yellows, browns, blacks, purples. It's refractory but also a flux. Magical stuff. Link to comment Share on other sites More sharing options...
Stellaria Posted April 30, 2014 Report Share Posted April 30, 2014 I'm fascinated with wood ash. Link to comment Share on other sites More sharing options...
neilestrick Posted April 30, 2014 Report Share Posted April 30, 2014 I love dolomite. It's not necessarily very interesting, but it's a great material and I use it in a lot of glazes. The one thing I couldn't live without is iron oxide. Like Tyler said, it's magical. Link to comment Share on other sites More sharing options...
Babs Posted May 1, 2014 Report Share Posted May 1, 2014 I'm with Tyler, iron!! A question, I live near a plateau whhose surface is made up of a large quantity of laterite rubble. If I pugmilled some smaller pieces in to my clay, would it give a bleed through effect at C5/6 temps. And I loove Gerstley Borate just because I do, unpredictable or not! Have a Supply of the old stuff so maybe that is why this affair keeps going.. Link to comment Share on other sites More sharing options...
Biglou13 Posted May 1, 2014 Report Share Posted May 1, 2014 What the woodfired kiln provides...... From thick milk chocolate to,flashing, to bidoro, to green pine ash deposits, to pastels. Ok it s not technically a glaze. Ok maybe not what you looking for alberta slip, and gerstly borate are my latest muses. Link to comment Share on other sites More sharing options...
TJR Posted May 1, 2014 Report Share Posted May 1, 2014 I like cobalt carbonate. Also copper carbonate. I wanted to name my twin sons cobalt and copper, but my wife said "no". I like cobalt because you know what you are getting. I like copper because you don't know what you are getting. TJR. I use them for on-glaze brush decorating. Link to comment Share on other sites More sharing options...
Denice Posted May 1, 2014 Report Share Posted May 1, 2014 Spodumene fell in love with it when it was used in a soda fire. Denice Link to comment Share on other sites More sharing options...
Marcia Selsor Posted May 1, 2014 Report Share Posted May 1, 2014 I go with Dolomite. Like Neil. I like the smooth soft semi matt surfaces and the color responses I get with it. Copper is my favorite colorant for the wide range of responses to fluxes. Marcia Link to comment Share on other sites More sharing options...
dave the potter Posted May 1, 2014 Report Share Posted May 1, 2014 I have to put my 2 cents worth in for rutile. It is a great colorant by itself and can modify colors and give some sparkle to glazes with other colorants. Link to comment Share on other sites More sharing options...
williamt Posted May 1, 2014 Report Share Posted May 1, 2014 Spodumene or just plain lithium carbonate. The lithium does interesting things with other oxides. Have to say though that iron oxide is very versatile. Lee Link to comment Share on other sites More sharing options...
Biglou13 Posted May 1, 2014 Report Share Posted May 1, 2014 Ok you spodumene fans I have some can you share a cone 6 ox recipe? Link to comment Share on other sites More sharing options...
Pugaboo Posted May 3, 2014 Report Share Posted May 3, 2014 Not tons of experience here but that said currently I am in love with rutile, blue rutile to be exact it's a wonderful thing and so far plays well with other glazes layered and side by side. I also agree that the oxides are really great especially red iron oxide alone or in glazes. Terry Link to comment Share on other sites More sharing options...
earthfan Posted May 5, 2014 Report Share Posted May 5, 2014 I love alkaline glazes for their colours, but crazing is unacceptable so I like the lithium minerals for sources of lithium oxide that aren't soluble. Lithium oxide has a negative coefficient of thermal expansion which theoretically offsets the high expansion of the other alkalis - sodium and potassium. I have a lovely glaze at cone 9 that has 20% petalite in it that does not craze. Unfortunately, now that lithium can be extracted so cheaply from brine in South America, it isn't financially viable to smash up rocks anymore, so petalite is no longer available. I have just bought the last 7 kilos of lepidolite in Australia. Lithium carbonate would be great if it wasn't for its solubility. The world's biggest spodumene mine is in my state, so I have 25 kilos of what they call 'spodumene concentrate' which includes 15% of silica, and that's OK. The difficulty is that it is sand, not powder. I have been told that I can calcine it to about 1150°C which changes it to Beta spodumene which is easy to grind in a mortar and pestle. I haven't done it yet, and I am not looking forward to it. Link to comment Share on other sites More sharing options...
earthfan Posted February 9, 2015 Report Share Posted February 9, 2015 Re: spodumene concentrate from Greenbushes mine in Western Australia. I fired a bowl half full of the spodumene sand to about cone 7. This is a guesstimate, because although Cone 9 was down, the bottom shelf was seriously underfired. The spodumene in the bowl puffed up to twice its volume and developed deep cracks in its surface. The pile which had been sand was now flour, no grinding required. I have read in a couple of books that lithium glass does not have a negative co-efficient of thermal expansion. Only the crystalline forms do. But the same books say that up to about .09 of mole, lithium oxide does help cure crazing. More has the opposite effect. Link to comment Share on other sites More sharing options...
rakukuku Posted February 17, 2015 Report Share Posted February 17, 2015 i like spodumene and lepidelite because they are funny words. but rutile rocks. also a good scrabble word. rakuku Link to comment Share on other sites More sharing options...
Brian Reed Posted February 20, 2015 Report Share Posted February 20, 2015 I have some dug dark brown clay that is locally dug, I have done some tests, but ultimately decided to made slip from it and I use it straight out of the ground. I make a thin slurry and run it through an 80 mesh sieve and there you go. A wonderful slip iron rich and very local. I do nothing, but add water. Link to comment Share on other sites More sharing options...
High Bridge Pottery Posted February 20, 2015 Report Share Posted February 20, 2015 I like whiting because it is cool to melt down million year old life into glazes. Link to comment Share on other sites More sharing options...
C.Banks Posted February 20, 2015 Report Share Posted February 20, 2015 I have some dug dark brown clay that is locally dug, I have done some tests, but ultimately decided to made slip from it and I use it straight out of the ground. I make a thin slurry and run it through an 80 mesh sieve and there you go. A wonderful slip iron rich and very local. I do nothing, but add water. In thinking about this question I imediately thought iron but I want to wholeheartedly agree with your post. I overlooked the simplest answer. The answer is lterally under my nose. Link to comment Share on other sites More sharing options...
Marcia Selsor Posted February 20, 2015 Report Share Posted February 20, 2015 I added another: Rutile because it can do so much at so many temperatures. Link to comment Share on other sites More sharing options...
Crusty Posted February 24, 2015 Report Share Posted February 24, 2015 I like whiting because it is cool to melt down million year old life into glazes. Dried Sea bed. Really cool stuff, a lot of calcium in it as well. that's why so many rock quarries have blue water in them. I think its one of the coolest mined products in a glaze as well... we have a fossil bed about 8 miles from the house, really cool critters in it... Link to comment Share on other sites More sharing options...
Rebekah Krieger Posted February 24, 2015 Report Share Posted February 24, 2015 I haven't made any yet, but I love what strontium does to everyday glazes.... Link to comment Share on other sites More sharing options...
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