CPT Posted March 22, 2012 Report Share Posted March 22, 2012 Hi: I have just finished some coffee mugs using Duncan Concepts underglazes. I dipped the entire mugs using Duncan's Clear Dipping Glaze. When I fired to Cone 6, it made my colors run together underneath....the colors weren't as brilliant. Can I still pour some clear glaze just on the INSIDE and rim of the mug, to make it food safe? Link to comment Share on other sites More sharing options...
CPT Posted March 22, 2012 Author Report Share Posted March 22, 2012 Hi: I have just finished some coffee mugs using some Duncan Concepts underglazes. I dipped the entire mugs using Duncan's Clear Dipping Glaze. When I fired to Cone 6, it made my colors run together underneath....the colors weren't as brilliant. Can I still pour some clear glaze just on the INSIDE and rim of the mug, to make it food safe? Link to comment Share on other sites More sharing options...
neilestrick Posted March 22, 2012 Report Share Posted March 22, 2012 Those underglazes and the clear glaze are intended for low fire work, not mid range. While some hold up fine, may are not recommended for cone 6, and many start to gloss over. SEE HERE. For underglazes that won't run at cone 6, I recommend Speedball, and some of the Amaco Velvets. You also need a clear glaze that is formulated for cone 6. Link to comment Share on other sites More sharing options...
thatmadwoman Posted March 28, 2012 Report Share Posted March 28, 2012 Duncan glazes are only really good at cone 06, bisque mugs fired to cone 04 then underglazed and clear dipped should then be fired to 06 and come out fine. Making sure the clear is not too heavy helps too. For higher temps I agree with Neilestrick. Link to comment Share on other sites More sharing options...
Stillwater Posted March 30, 2012 Report Share Posted March 30, 2012 I have used Duncan concepts and tested in a variety of ways. Cone 6, cone 04, single fire, etc. (all worked well!) Although the colors aren't as bright at cone 6 (with Amoco's HF-10 over) they are still nice (greens were a little dull). The concepts seemed to get a bit glossy on their own without a glaze as well. I needed the bright colors for a elementary school outdoor tile mural. so I bisque fired to cone 6 and glaze fired to cone 04 using the LG-10 clear over. It worked beautifully! Bright colors and strength. It has been up for 6 years in WI. winters and looks great. I also like the Amoco Velvets a lot. some colors are not as bright (dull greens mostly and iron reds seem to burn out). I have also tried testing of (1%-30%) additions of Mason stain to my porcelain throwing body and have been very successful. The clear glaze you use will have a great influence on color. Good luck and Happy testing Hang in there. Link to comment Share on other sites More sharing options...
Susa Posted March 31, 2012 Report Share Posted March 31, 2012 I have used Duncan concepts and tested in a variety of ways. Cone 6, cone 04, single fire, etc. (all worked well!) Although the colors aren't as bright at cone 6 (with Amoco's HF-10 over) they are still nice (greens were a little dull). The concepts seemed to get a bit glossy on their own without a glaze as well. I needed the bright colors for a elementary school outdoor tile mural. so I bisque fired to cone 6 and glaze fired to cone 04 using the LG-10 clear over. It worked beautifully! Bright colors and strength. It has been up for 6 years in WI. winters and looks great. I also like the Amoco Velvets a lot. some colors are not as bright (dull greens mostly and iron reds seem to burn out). I have also tried testing of (1%-30%) additions of Mason stain to my porcelain throwing body and have been very successful. The clear glaze you use will have a great influence on color. Good luck and Happy testing Hang in there. Link to comment Share on other sites More sharing options...
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