Mermoose Posted February 8, 2015 Report Share Posted February 8, 2015 I am thinking of using Tin Oxide to make my carving stand out on dark brown (#266) clay. My teacher says he has never heard of it used this way. My hope is that the Tin oxide will make the flower petals turn out white after bisque firing so I could then wax resist prior to glazing. Anyone out there care to comment? Would love to hear from more experienced people Link to comment Share on other sites More sharing options...
Mark C. Posted February 8, 2015 Report Share Posted February 8, 2015 Tin Oxide is expensive and you could do this in other ways. Heres a few to try before bisquing- Make the pedals out of white clay would work well. Use a white clay slip on pedals use kiln wash -this works all by it's self or you can add flux if you like-this works well You can brush on a white glaze as well Make up some tests and see what you like best. Mark Link to comment Share on other sites More sharing options...
TJR Posted February 8, 2015 Report Share Posted February 8, 2015 I agree with Mark. Tin ox. is not the material you want-too expensive.It is used as an opacifier in a glaze. TJR. Link to comment Share on other sites More sharing options...
bciskepottery Posted February 8, 2015 Report Share Posted February 8, 2015 I've used both white underglaze and a white slip to accent marks on 266. The picture shows the use of a wash to highlight texture on the vase in the foreground. The small white dots are feldspar that I added to the 266. The vase in the background is Laguna's Dark Brown, wood fired. The white slip recipe I use is attributed to Cynthia Bringle. I've used the slips in electric, gas, salt, and wood fires, both cones 6 and 10. They can be applied to leatherhard or bisque (need to be thinned). They can be applied over glaze (thin to watercolor consistency). And, the slip recipe is more akin to a glaze in terms of composition. Bringle Slip EPK, 20 Ball clay, 20 Neph Sy, 25 Silica, 30 Gerstley Borate/Borax, 5 Total base, 100 White -- Tin Oxide, 7 Borax, 5 Bentonite, 2 Total, 114 or Zircopax, 7.5 Bentonite, 2 Total, 109.5 Link to comment Share on other sites More sharing options...
Mermoose Posted February 8, 2015 Author Report Share Posted February 8, 2015 Thanks for the comments and recipes. I did not think to apply the slip before the platter dried. Thats why I was thinking of Oxides...I don't have many chemicals available and don't happen to have a white underglaze. For some reason I do have a small amount of dry Gerstley borate. I only have a small amount of tin that was mixed with water for experimentation. ( also other oxides. red iron, cobalt,ochre, chrome...) As to slips, all that I have made up is light slip composed of Phoenix clay and water and dark slip from the 266. I am not educated in art at all. This is all on the job training for me... Link to comment Share on other sites More sharing options...
Callie Beller Diesel Posted February 8, 2015 Report Share Posted February 8, 2015 I have successfully applied some slips directly to bisque, much the same way a glaze would be. Thin application is best, and the slip should be about the same consistency as a glaze. Yes, it's pushing the material, but sometimes it's worth a shot. Link to comment Share on other sites More sharing options...
oldlady Posted February 8, 2015 Report Share Posted February 8, 2015 slip will work on a dry platter if you use it carefully and not too thickly at one time. slip is clay so adding it is simply thickening the clay you already have. trying to add slip to a bisque piece would involve much more luck than skill and probably will not result in what you want to do. Link to comment Share on other sites More sharing options...
Mermoose Posted February 9, 2015 Author Report Share Posted February 9, 2015 Thank you Old Lady. I was afraid the drying rates would differ too much.?... Link to comment Share on other sites More sharing options...
Callie Beller Diesel Posted February 9, 2015 Report Share Posted February 9, 2015 slip will work on a dry platter if you use it carefully and not too thickly at one time. slip is clay so adding it is simply thickening the clay you already have. trying to add slip to a bisque piece would involve much more luck than skill and probably will not result in what you want to do. It's not luck at all. Glaze is a glorified slip, with different proportions of flux, silica and alumina. Try Fish Sauce (ACAD shop slip) 43.7 Grolleg 23.5 soda feldspar (kona) 15.6 Silica 9.4 Bentonite 7.8 pyrophylite It stays pretty dry at all temps, and takes colourants well. The pyrophylite helps it not spall off the pot. It works, I swear. Link to comment Share on other sites More sharing options...
Babs Posted February 10, 2015 Report Share Posted February 10, 2015 Diesol Clay, what is pyrophylite? Its properties? Link to comment Share on other sites More sharing options...
Callie Beller Diesel Posted February 10, 2015 Report Share Posted February 10, 2015 http://digitalfire.com/4sight/material/pyrophyllite_1167.html The good folks at digital fire have the long version above. The summary for the rest of us is that It's a mineral that is a refractory (not very melty or plastic) source of both alumina and silica, and it has low thermal expansion. If you substitute some of it in for feldspar or other flux, you make your slip less vitreous, but because it doesn't shrink and expand drastically when you heat or cool it, in this instance it helps the slip stay on the pot. It usually gets used in a clay body to reduce thermal expansion/improve glaze fit, and improve fired strength. Link to comment Share on other sites More sharing options...
Mermoose Posted February 10, 2015 Author Report Share Posted February 10, 2015 Diesel Clay, I do not understand what you are telling me to mix up. Fish Sauce?....I am unaccustomed to the terms,,, Is this a complete slip recipe?... Sorry I just don't get it. T~ Link to comment Share on other sites More sharing options...
Babs Posted February 10, 2015 Report Share Posted February 10, 2015 Thanks Deisol Clay, succintly put! As always.Fish Sauce name of the slip recipe . Link to comment Share on other sites More sharing options...
ayjay Posted February 11, 2015 Report Share Posted February 11, 2015 Slip made with a 50/50 mix of Ball Clay and China Clay (+ oxides if required) will work on bisque. Link to comment Share on other sites More sharing options...
Callie Beller Diesel Posted February 11, 2015 Report Share Posted February 11, 2015 You put fish sauce on everything in Thai food. So we named the slip Fish Sauce. Link to comment Share on other sites More sharing options...
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