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G1947U pales in comparison with the brilliantly transparent results possible at lower temperature. Can we improve it?
Project Name Develop a Better Cone 10R Transparent Project Codenumber UnAssigned Notes G1947U was developed from a transparent glaze originally used for porcelain insulator manufacturer. To create G1947U I changed that recipe to source CaO from wollastonite instead of calcium carbonate and added a little zinc to start melting earlier. |
Cone 10R Transparent Base
Total:100.00 Auto Unity Formula
Notes *This glaze can be used in oxidation or reduction for a crystal clear. It works well in reduction on whiteware bodies like Plainsman P580 and P590 and is also good on all other high temperature stonewares (even iron reduction). Pictures Ravenscrag GR10 variations outside, G1947U inside Left mug inside: G1947U clear H550 with RavenTalc base, G1947U Transparent The G1947U (right) really enhances the speckle. The GR10-C (left) mutes it much more and adds color. G1947U, G3910 on H443 at Cone 10R The fritted version on the right is pickup up the iron color and has less micro-bubbles, thus is more transparent. G1947U, G3910 on H550 at Cone 10R G1947U is more opaque, likely because it is hosting more micro-bubbles. G1947U on H570 an H550 - Cone 10R On H450, P600 at cone 10 oxidation On H450, P600 at cone 10 oxidation G1947U using Grolleg Kaolin P700 porcelain P5797. Left: EPK. Right: Grolleg Kaolin (produces bluish color). Typecodes ST-Untitled typecode Alternate Code Number:GS10-C XML (to paste into Insight) <?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Cone 10R Transparent Base" id="63912" key="Sq5sYTwo" date="2023-04-24" typecodes="ST" codenum="G1947U" picturebasename=""> <recipelines> <recipeline material="Custer Feldspar" amount="27.000" tolerance=""/> <recipeline material="EP Kaolin" amount="20.500" tolerance=""/> <recipeline material="Silica" amount="26.500" tolerance=""/> <recipeline material="Wollastonite" amount="23.500" tolerance=""/> <recipeline material="Zinc Oxide" amount="2.500" tolerance=""/> </recipelines> </recipe> </recipes> Born: 1994-06-30, Modified: 2023-04-24 11:01:34 |
Fritted version of G1947U #1
Total:120.00 Auto Unity Formula
Notes *This changes G1947U as follows: Pictures G1947U, G3910 on H443 at Cone 10R The fritted version on the right is pickup up the iron color and has less micro-bubbles, thus is more transparent. G1947U, G3910 on H550 at Cone 10R G1947U is more opaque, likely because it is hosting more micro-bubbles. G3910 ball melt test (vs. G1947U) G3910 Transparent flow test (vs. G1947U) G1947U stains, G3910 does not Felt pen, cleaned with acetone. Cone 6 melt comparison G1947U/G3910 Cone 10ox comparison G3910/G3910 G3910+5% tin on P700 Cone 10ox No crazing after several months. Typecodes ST-Untitled typecode Alternate Code Number:GS10-C XML (to paste into Insight) <?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Fritted version of G1947U #1" id="186159" key="H2ch7Ma2" date="2022-05-26" typecodes="ST" codenum="G3910" picturebasename=""> <recipelines> <recipeline material="Ferro Frit 3110" amount="28.500" tolerance=""/> <recipeline material="Calcined Kaolin" amount="12.500"/> <recipeline material="Ferro Frit 3249" amount="4.500"/> <recipeline material="EP Kaolin" amount="18.500" tolerance=""/> <recipeline material="Silica" amount="35.500" tolerance=""/> <recipeline material="Wollastonite" amount="20.500" tolerance=""/> </recipelines> </recipe> </recipes> Born: 1994-06-30, Modified: 2022-05-26 18:25:10 |
Fritted version of G1947U #2
Total:100.00 Auto Unity Formula
Notes *Changes G3910 as follows: Pictures G3910A H550 mug The glaze is ultra-clear, but this firing did not properly clear at the end, the lack of air flow left carbon on the insides of pieces like this. The early melting of this glaze might have been an issue, but likely not because the upper section is clear. G3910A on H550 - some crawling Lots of tiny crawls on the edges of the incised design. But this is the most transparent glaze I have ever seen at cone 10R. G3910A on H550 - very good result G3910A carbon trapping on P700 This is happening because reduction was too heavy and this melts very early. G3910A over black slip, clouds where thick This is likely happening because this firing was too heavily reduced. L4476 H570 mug cone 10ox firing Glaze is G2571D1 and G3910A L4475B P600 cone 10ox mug Glaze is G2571D1 and G3910A Typecodes ST-Untitled typecode Alternate Code Number:GS10-C XML (to paste into Insight) <?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Fritted version of G1947U #2" id="188286" key="1M2k3JiT" date="2021-11-09" typecodes="ST" codenum="G3910A" picturebasename=""> <recipelines> <recipeline material="Ferro Frit 3110" amount="21.800" tolerance=""/> <recipeline material="Fusion Frit F-69" amount="3.600" tolerance=""/> <recipeline material="Grolleg Kaolin" amount="25.900" tolerance=""/> <recipeline material="Silica 400 mesh" lookup="Silica" amount="32.100" tolerance=""/> <recipeline material="Wollastonite" amount="16.600" tolerance=""/> </recipelines> </recipe> </recipes> Born: 1994-06-30, Modified: 2021-11-09 14:09:11 |