Pres Posted November 28, 2021 Report Share Posted November 28, 2021 No new questions in the pool, folks! QotW: All things considered, What coloring oxide would you not be able to work without? My favorite oxide over the years has been the most simple. . . iron oxide. I like so many other oxides and their uses, but nearly everything I do has some bit of iron in it. It softens so many other oxides, and works well in washes over and under glazes, and I find it versatile in so many ways that I can not imagine being without it. best, Pres kristinanoel, Bill Kielb and Hulk 3 Quote Link to comment Share on other sites More sharing options...
Magnolia Mud Research Posted November 28, 2021 Report Share Posted November 28, 2021 Sodium; soda ash/baking soda actually! LT Hulk 1 Quote Link to comment Share on other sites More sharing options...
oldlady Posted November 28, 2021 Report Share Posted November 28, 2021 not an oxide but a carbonate, copper. would someone who is the chemical expert in your area please explain the difference between oxide and carbonate for those of us without your education? Hulk and kristinanoel 2 Quote Link to comment Share on other sites More sharing options...
LeeU Posted November 29, 2021 Report Share Posted November 29, 2021 I don't have any I can't work without because I don't have any that I use in the first place. I get mainstream commercial glazes such as Amaco's awesome Ancient Copper , or some w/cobalt, that do the job for me, to a modest extent. My days of dealing at all with chemistry are long over, "halleluiah thank ya Jesus" as they say. There is such an amazing wonderful world to be had via that chemistry (coloration oxides, for example), but I am grateful just to be able to make what I want, when I want, if I want, in my own space, all by the simple click of an online "check out now" function! Hulk 1 Quote Link to comment Share on other sites More sharing options...
Hulk Posted November 29, 2021 Report Share Posted November 29, 2021 I'd like to respond to colorant (and leave oxide/other aside for now) - I like cobalt, copper, tin, chrome, rutile, zirconium, and some pre-made stuff (underglaze) as well, so far. If I had to had to pick one, it would come down to tin/chrome (ya, that's two -> for shades o' red) or rutile (iron, titanium, and maybe some pinches o' other stuff, ya, it's not one either!). Pres and Bill Kielb 2 Quote Link to comment Share on other sites More sharing options...
LinR Posted November 29, 2021 Report Share Posted November 29, 2021 Couldn't live without cobalt preferably with a bit of copper. Lin Bill Kielb and Pres 2 Quote Link to comment Share on other sites More sharing options...
Russ Posted November 29, 2021 Report Share Posted November 29, 2021 Iron oxide is the main colorant in practically every glaze i make. Rutile would come second not as a colorant but just for the effect it has on glazes. 3rd cobalt ox or carb. Pres, kristinanoel and Bill Kielb 3 Quote Link to comment Share on other sites More sharing options...
Pres Posted November 29, 2021 Author Report Share Posted November 29, 2021 Getting more varied answers than I had figured, as my question was about coloring oxides, but what the heck, I'm tolerant, and and answer is an answer! I'm way past test grading days! best, Pres LeeU 1 Quote Link to comment Share on other sites More sharing options...
Callie Beller Diesel Posted November 29, 2021 Report Share Posted November 29, 2021 Titanium. Need some visual texture! Bill Kielb 1 Quote Link to comment Share on other sites More sharing options...
Magnolia Mud Research Posted November 29, 2021 Report Share Posted November 29, 2021 2 hours ago, Pres said: ... as my question was about coloring oxides, but what the heck, I'm tolerant, and and answer is an answer! ... Pres: Sodium (oxide) does effect the color on the clay bodies I use; therefore I consider the sodium based material to be a "colorant". applied as an aqueous mist sprayed on bisque ware will, as a minimum, change the "value" of the color of the sprayed regions, and as a maximum, will produce the orange color common to salt/soda firing. Greatest effect is on stoneware that has some iron tinges when fired. sodium borates and phosphates also are "value" changers. I am more interested in contrasts between areas than producing a specific "spot" between infra red and ultra-violet in the visible light spectrum. 18 hours ago, oldlady said: would someone who is the chemical expert in your area please explain the difference between oxide and carbonate for those of us without your education? oldlady: Many of the ingredients that we use are carbonates (and/or other metallic based materials); the carbonates are thermally decomposed to "oxides" during the firings. Water is a (di)hydrogen oxide. Hydrogen carbonate is carbon dioxide dissolved in water. other examples: Sodium carbonate (soda ash) is the material produced by the reaction of sodium oxide and carbon dioxide; calcium carbonate (whiting) is the material produced by the reaction of calcium oxide and carbon dioxide, ... and so on for other metal carbonates. Each carbonate material will decompose to the metal oxide and carbon dioxide at its own specific temperature range. Hydrogen carbonate decomposes at below room temperature while other carbonates (sodium, calcium, cobalt, copper, ...) will need temperatures around and/or above cone 022 (~600 C). LT (Ik ben chemisch ingenieur) Hulk and oldlady 2 Quote Link to comment Share on other sites More sharing options...
Pres Posted November 29, 2021 Author Report Share Posted November 29, 2021 Still stand by my previous above, and it is good to have one to educate others about chemistry. Did I ever mention here that I used to be a Chemistry major in the early college years, working as a lab assistant for all of the compounds needed for experiments the prof assigned. Left me with a healthy respect for chemicals, and an extreme dislike for equations! best, Pres Magnolia Mud Research and Babs 2 Quote Link to comment Share on other sites More sharing options...
Min Posted November 29, 2021 Report Share Posted November 29, 2021 This question is kind of like asking who's your favourite child. Somedays one can be a "problem" child but on other days they can shine. For a glaze colourant /visual texturizer I can't do without I'ld have to choose rutile, but then again not all rutile behaves as well as others so it too can be a problem child. As far as consistency goes cobalt has always done what it's supposed to do. Pres, Callie Beller Diesel and Bill Kielb 3 Quote Link to comment Share on other sites More sharing options...
Chilly Posted November 30, 2021 Report Share Posted November 30, 2021 On 11/28/2021 at 11:51 PM, oldlady said: would someone who is the chemical expert in your area please explain the difference between oxide and carbonate for those of us without your education? https://www.differencebetween.com/difference-between-cobalt-oxide-and-cobalt-carbonate/ Read carefully @oldlady! Test papers will be sent round later - lol. Pres, oldlady and Bill Kielb 3 Quote Link to comment Share on other sites More sharing options...
oldlady Posted November 30, 2021 Report Share Posted November 30, 2021 (edited) thank you, chilly and LT, can't take the test yet, chilly. the oddest thing happened. your link led me to a great answer but someone put an ad about prostate cancer with graphics all over that page. i just did not have time to wade through the setup. besides, i have 1000 things to do today before leaving for florida for the winter. it is 2 degrees above freezing today. i will read the link when i get there and have a moment without a crisis. Edited November 30, 2021 by oldlady correction Chilly 1 Quote Link to comment Share on other sites More sharing options...
Pres Posted November 30, 2021 Author Report Share Posted November 30, 2021 Safe travels, @oldlady! best, Pres oldlady 1 Quote Link to comment Share on other sites More sharing options...
Mark C. Posted December 1, 2021 Report Share Posted December 1, 2021 (edited) For me its not my favorite glaze but my customers favorites and thats cobalt Oxide-its used in 420 grams per batch in my simple black glaze which is used mostly as an underglaze with rutile base glaze over it. Its been published in CM a few times in my articles like the one in last October issue (2021) on Tumble stacking I am more of an iron glaze liker but could not make a living with that color palette I use alot of the higher purity iron these days . Edited December 3, 2021 by Mark C. Bill Kielb 1 Quote Link to comment Share on other sites More sharing options...
neilestrick Posted December 1, 2021 Report Share Posted December 1, 2021 Red iron oxide. It's in about half of my studio glazes. Sometimes it's the main colorant, in others it's used to tone down the brightness of other colorants. No other oxide can make as many colors RIO, it just depends on glaze formula, temperature, and firing method. Pres, Bill Kielb and kristinanoel 3 Quote Link to comment Share on other sites More sharing options...
Hulk Posted December 3, 2021 Report Share Posted December 3, 2021 (edited) Regarding oxide or carbonate, there was something about that tickling in my memory - thought it was well put, but couldn't remember any detail, nor the source*. Sometime later, having swept through a few Tony Hansen articles, thought maybe in Peterson's book**, ah, In Glazes chapter, under topic Colors, subtitle Metallic Oxides "Natural metallic oxides that withstand kiln temperatures are few, so the palette is limited. ...some come to us in the form of carbonates; ...Carbonates are weaker in color than oxides because they have an added atom of carbon and three atoms of oxygen per atom of metal. (...accordingly cost less, usually). ...Salts of metals, such as chlorides, sulfates, and nitrates can also be used as colorants." One could, and probably should look into how the various materials are safely handled, for some are more soluble, toxic, etc. *I enjoy this forum! Initially, was looking for info on equipment, since, there are personalities, also interesting topics/information - stuff I wouldn't otherwise see/read/think about - maybe, gets me thinking, and even researching. **The Craft and Art of Clay Wherein, still the best explanation of unity, imo, and other stuff, including pictures. Edited December 4, 2021 by Hulk gram at i'call oldlady and Bill Kielb 2 Quote Link to comment Share on other sites More sharing options...
Denice Posted December 4, 2021 Report Share Posted December 4, 2021 Is yellow ocher a coloring oxide? I have used it as a coloring oxide, you have to use a large of percentage of it to get any color in a white glaze base. Denice Quote Link to comment Share on other sites More sharing options...
Pres Posted December 4, 2021 Author Report Share Posted December 4, 2021 3 hours ago, Denice said: Is yellow ocher a coloring oxide? I have used it as a coloring oxide, you have to use a large of percentage of it to get any color in a white glaze base. Denice Yes it is a coloring oxide. . yellow iron oxide. It is cheap, and weak. It appears yellow, but fires red by itself. I use it in Richard's Nutmeg, a recipe I think I got from the Van Gilder book. best, Pres Quote Link to comment Share on other sites More sharing options...
kristinanoel Posted January 25, 2022 Report Share Posted January 25, 2022 Late to the party but I say rutile - I call it 'interesting powder', with RIO a close second. Pres 1 Quote Link to comment Share on other sites More sharing options...
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