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The 20x5 Recipe Has Been Improved
The popular Gerstley Borate 50:30:20 glaze recipe will soon be impossible. But it can be made using Gillespie Borate and frits. And improved.
50:30:20 Gerstley Borate Cone 6 base
Total:100.00 Auto Unity Formula
Notes *This is recipe has been around for a long time. It is the base for many others, mainly because of its high melt fluidity (e.g. Butterscotch (Rust) added: 4% rutile, 4% tin oxide and 1% lithium carboante. Pictures G2826A vs G2826A1 low test A1 supplies boron using frit 3134. G2826A Gerstley Borate 50:30:20 base as jelly G2826A on M390 - lots of boron blue You might think this looks nice. But it comes at a cost (bubbling, jelling, running, cracking on drying, crawling). Boron blue is considered a glaze fault. Fired at 1700F G2826A 50:30:20 GB Fired at 1700F XML (to paste into Insight) <?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="50:30:20 Gerstley Borate Cone 6 base" id="67237" key="CLDHjmPY" date="2024-10-02" codenum="G2826A" picturebasename=""> <recipelines> <recipeline material="Gerstley Borate" amount="50.000" tolerance=""/> <recipeline material="EPK" amount="20.000" tolerance=""/> <recipeline material="Silica" amount="30.000" tolerance=""/> </recipelines> </recipe> </recipes> Born: 2000-04-18, Modified: 2024-10-02 18:51:28 |
50:30:20 Frit 3134 cone 6 base
Total:105.00 Auto Unity Formula
Notes *This was a product of substituting Ferro Frit 3134 for Gerstley Borate in the long-time G2826A base transparent recipe. This was originally done in the 1970s. Pictures Typecodes RCP-Undefined XML (to paste into Insight) <?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="50:30:20 Frit 3134 cone 6 base" id="63485" key="9Fu3fMsP" date="2024-10-02" typecodes="RCP" codenum="77C04E" picturebasename=""> <recipelines> <recipeline material="Ferro Frit 3134" amount="50.000" tolerance=""/> <recipeline material="EPK" amount="30.000" tolerance=""/> <recipeline material="Silica" amount="25.000" tolerance=""/> </recipelines> </recipe> </recipes> Born: 1980-01-01, Modified: 2024-10-02 19:20:26 |
50:30:20 Frit 3134 base (fixed)
Total:100.00 Auto Unity Formula
Notes *The 77C04E base (50:30:20 Frit 3134:silica:kaolin) has multiple issues as an alternative to the original 50:30:20 Gerstley Borate G2826A recipe. This addresses those. Pictures G2826A vs A1 50:30:20 base flow test The flow of the fritted version (on the right) has no boron-blue, more surface tension, less LOI disruption. Fluidity is only a little less even though this has less boron. G2826A, G2826A1 on M340, M370 Boron blue gone on the fritted version. G2826A vs G2826A1 demos Gerstley Borate vs Frits to source boron If a better quality functional glaze is needed then the G2826A1 fritted version on the right is much better. That being said, many people seek the visual character of the one on the left. Perhaps a mix of the two could reduce some of the working and technical issues with the G2826A version. G2826A vs G2826A1 low test A1 supplies boron using frit 3134. G2826A3 vs G2826A1 - Fired to 1700F The G2826A1 employs a frit, the G2826A2 (left) Gillespie Borate. XML (to paste into Insight) <?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="50:30:20 Frit 3134 base (fixed)" id="223705" key="smHaoqd5" date="2023-09-08" codenum="G2826A1" picturebasename=""> <recipelines> <recipeline material="Ferro Frit 3134" amount="29.000" tolerance=""/> <recipeline material="EPK" amount="19.000" tolerance=""/> <recipeline material="Fusion Frit F-69" amount="20.000" tolerance=""/> <recipeline material="325 mesh silica" lookup="Silica" amount="22.000" tolerance=""/> <recipeline material="Wollastonite" amount="10.000" tolerance=""/> </recipelines> </recipe> </recipes> Born: 2000-04-18, Modified: 2023-09-08 03:23:36 |
50:30:20 Gillespie Borate Cone 6 base
Total:100.00 Auto Unity Formula
Notes *It substitutes Gillespie Borate directly for Gerstley Borate in the popular G2826A 50:30:20 recipe. Pictures G2826A, G2826A1 50:30:20 glaze On the left is uses Gerstley Borate, on the right Gillespie Borate. This was fired to cone 6 using the PLC6DS schedule. G2826A, A2, A1 50:30:20 Gillespie Borate glaze Strangely, the frited one on the right has the most bubbles. It is also the most fluid. G2826A2 vs G2826A3 melt flow test G2826A2 vs G2826R2 Left: G2826A2, the 50:30:20 GB clear recipe. This is a nice transparent, and it has the same boron blue as Gerstley Borate had. XML (to paste into Insight) <?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="50:30:20 Gillespie Borate Cone 6 base" id="242662" key="K3A31bnQ" date="2024-03-08" codenum="G2826A2" picturebasename=""> <recipelines> <recipeline material="Gillespie Borate" amount="50.000" tolerance=""/> <recipeline material="EPK" amount="20.000" tolerance=""/> <recipeline material="Silica" amount="30.000" tolerance=""/> </recipelines> </recipe> </recipes> Born: 2000-04-18, Modified: 2024-03-08 17:02:25 |
50:30:20 GB Makeover Pottery Glaze
Total:100.00 Auto Unity Formula
Notes *Melt fluidity is a major problem with the 50:30:20 recipe, it is capable of dissolving its way through an insulating firebrick (see below)! This adjustment attempts to add some sanity to this classic recipe (less melt fluidity) and employ Gillespie Borate as a substitute for Gerstley Borate. Pictures G2826A3 50:30:20 Gillespie Borate test tile On L3905H Untitled G2826A3 vs G2926Bgi2 glazed mugs G2826A3 inside left. A2 vs A3 - Slow cool G2826A3 50:30:20 Gillespie Borate on test tiles On M370, MNS L4449J black and M390. G2826A2 vs G2826A3 melt flow test G2826A3 50:30:20 glaze - EPK vs Calcined Kaolin Fired at 1700F G2826A3 vs G2826A1 - Fired to 1700F The G2826A1 employs a frit, the G2826A2 (left) Gillespie Borate. XML (to paste into Insight) <?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="50:30:20 GB Makeover Pottery Glaze" id="243239" key="x21aZPjq" date="2023-09-25" codenum="G2826A3" picturebasename=""> <recipelines> <recipeline material="Gillespie Borate" amount="37.000" tolerance=""/> <recipeline material="EPK" amount="15.000" tolerance=""/> <recipeline material="325 mesh Silica" lookup="Silica" amount="35.000" tolerance=""/> <recipeline material="Nepheline Syenite" amount="10.000" tolerance=""/> <recipeline material="Talc" amount="3.000" tolerance=""/> </recipelines> </recipe> </recipes> Born: 2000-04-18, Modified: 2023-09-25 16:49:09 |