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We are one of about 90 ceramic suppliers in North America. But unlike almost all of them, we make most of our products from clays we mine and process ourselves. We intend to leverage this advantage to achieve the unmatched quality, assurance of supply and low prices this enables. Technical Tips BlogCone 6 transparent way better without Gerstley Borate.I surgically removed it to create G2926B!![]() These are the original cone 6 Perkins Studio Clear (left) beside our fritted version (right). You cannot just substitute a frit for Gerstley Borate (GB), they have very different chemistries. But, using the calculation tools in my account at insight-live.com, I compensated for the differences by juggling other materials in the recipe. I even upped the Al2O3 and SiO2 a little on the belief they would dissolve in the more active melt the frit would create. I was right - a melt-flow GLFL test comparison (inset left) shows that the GB version flows less. Using this on ware exhibited another issue (after doing a IWCT test): Crazing. The very good melt flow on my G2926A fritted version is thus good news: It can accept more silica - the more silica, the more durable and craze resistant it will be. How much did it take? 10% more! That ultimately became the recipe for our standard G2926B cone 6 transparent. Context: A Low Cost Tester.., Trafficking in Glaze Recipes.., Click here for case-studies.., Glaze Chemistry, We Developed the G2926B.. Monday 31st March 2025 Matte base glaze cutlery marks.Add 10% glossy glaze. No marking.![]() This is G2934Y (a version of the G2934 cone 6 matte base recipe that supplies much of the MgO from a frit instead of dolomite). Like the original, it has a beautiful fine silky matte surface and feels like it would not cutlery mark. But, as you can see on the left, it does! The marks can be cleaned off easily. But still, this is not ideal. The degree of matteness that a glaze has is a product of its chemistry. But can we fix this without doing any chemistry? Yes. By blending in some G2926B clear glossy (90:10 proportions). The result: The marks are gone and the surface is only slightly less matte. This underscores the need to compromise the degree of matteness, on food surfaces, enough to avoid staining and cutlery marking. Context: G2934Y, Concentrate on One Good.., Matte Glaze, Dolomite Matte, Cutlery Marking Friday 28th March 2025 DIY mold making using 3D printing just got easier.Mold natches, spacers, clips and embedsAvailable on the Downloads page ![]() Plastic natches are cast into plaster molds to provide a durable and good-fitting interlock between pieces. The traditional self-interlocking 3/8" or 9.5 mm (nipple diameter) one has not proven suitable for mold making based on 3D printing. Our solution is a four-part system. To use it, your 3D printed mold shells only need matched 13.5mm holes. Context: DIY natches spacers and.., CAD drawing of handle.., Standard 3 8 inch.., Glue-sticking the 3D printer.., Downloadable 3D model for.., Casting Slip, Mold Natches, Mold Natches Wednesday 26th March 2025 Mixing and pouring plaster into a 3D printed shell mold-Size of mixing container needed: 1L per 1000g of plaster. Context: Glazy Plaster Calculator, USG Plaster mixing instructions.. Tuesday 25th March 2025 Mason stains in the G2934 matte base glaze at cone 6![]() Stains can work surprisingly well in matte base glazes like the DIY G2934 recipe. The glass is less transparent and so varying thicknesses do not produce as much variation in tint as glossy bases do. Notice how low many of the stain percentages are here, yet most of the colors are bright. We tested 6600, 6350, 6300, 6021 and 6404 overnight in lemon juice, they all passed leach-free. The 6385 is an error, it should be purple (that being said, do not use it, it is ugly in this base). And chrome-tin pink and maroon stains do not develop the color (e.g. 6006). But our G1214Z1 CaO-matte comes to the rescue, it both works better with some stains and has a more crystal matte surface. The degree-of-matteness of both can be tuned by cooling speed and blending in some G2926B glossy base. You can mix any of these into brushing or dipping glazes. Context: Mason 6021 Red Stain, G2934, Stains Mason, G1214Z1, 5 titanium dioxide in.., G2934 cone 6 DIY.., Here is my setup.., Medium Temperature, Base Glaze, Ceramic Stain, Cone 6 Thursday 20th March 2025 Mason stains in the G2926B base glaze at cone 6![]() This glaze, G2926B, is our main glossy base recipe. Stains are a much better choice for coloring it than raw metal oxides. Other than the great colors they produce here, there are a number of things worth noticing. Stains are potent; the percentages needed are normally much less than for metal oxides. Staining a transparent glaze produces a transparent color, it is more intense where the laydown is thicker - this is often desirable in highlighting contours and designs. For pastel shades, add an opacifier (e.g. 5-10% Zircopax, more stain might be needed to maintain the color intensity). The chrome-tin maroon 6006 does not develop well in this base (alternatives are G2916F or G1214M). The 6020 manganese alumina pink is also not developing here (it is a body stain). Caution is required with inclusion stains (like #6021). Bubbling, as is happening here, is common - this can be mitigated by adding 1-2% Zircopax. And it’s easy to turn any of these into brushing or dipping glazes. Context: Mason 6021 Red Stain, Stains Mason, G2926B, Concentrate on One Good.., Mason 6600 Black Stain, Here is my setup.., G2926B cone 6 transparent.., When using stains customize.., Medium Temperature, Cone 6, Colorant, Base Glaze, Ceramic Stain Thursday 20th March 2025 Gunmetal black mug demos liner glazing:Safe glaze inside, pigmented matte outside.![]() The outside glaze is G2934Y cone 6 black. I use the C6DHSC slow cool firing schedule to get this degree of matteness in the black. The body is the natural MNP (Mother Nature's Porcelain), it vitrifies to zero porosity around cone 4 (yet is stable to cone 8). At cone 6 it produces incredibly strong ware and works well with these two glazes. The inside liner glaze is GA6-B (made using real Albany Slip rather than Alberta Slip in this case). Although the melt characteristics of these two glazes are so different they can be applied to meet in a perfect line at the rims of pieces. Food safety labelling is not what you think it is - do liner glazing to be safe. Context: Albany Slip, Meet two glazes at.., Feeling good about the.., Liner Glazing Thursday 20th March 2025 Shrinking glaze = peeling glaze![]() Dipping glazes peel like this because they contain clay and shrink as they dry (the fact that all of them don't do this is actually amazing). Success is a matter of the shrinkage being low enough, the drying being fast enough, the layer being thin enough, the bisque being absorbent enough, and the bond with the bisque being good enough. Glazes with high clay content, thick applications or multi-layering are the main offenders. Thixotropic slurries apply most evenly and are least likely to go on too thick. Dipping glazes having 15-20% kaolin or ball clay are easiest to slurry up and have the best application and drying properties. Mixing base layers as first-coat dipping glazes is also important. Context: Glaze Layering, Glaze peeling on drying.. Friday 14th March 2025 Lord Ganesha made from Plainsman Clay![]() In August Hindus of India make these for an annual festival. Many of them now live in Canada - and in Alberta. And they come to Plainsman Clays to get the clay. There is much symbolism in the figure and the fact that it is made from raw clay. This is used during a 10-day festival marking the arrival to earth of the elephant-headed deity Ganesha, son of Lord Shiva and Goddess Parvati. He is their god of prosperity and wisdom. The festival begins on the fourth day (chaturthi) of the month of Bhadrapada (August–September), the sixth month of the Hindu calendar. Food is offered each day. Elephants don't walk around obstacles, neither are they stopped by them. They just remove them and walk ahead. In the worship Lord Ganesha Hindus take on these qualities. These were made in Calgary. The one on the left was made using M332. The one on the right was made using found-clay from a garden. These idols are not fired in a kiln. When the celebration is complete they are immersed in water (for a measured period of days) and after the clay has finished slaking it is returned to the land. Context: The symbolism of Lord.. Friday 14th March 2025 A potter fixes a leaching glaze problem![]() G1214Z1 is a popular cone 6 calcium matte glaze recipe. It has very high melt fluidity, enabling a fine grained crystalline matte surface to develop during cooling. A potter was steered to this recipe after finding that G2934 magnesia matte fired too variegated when stained blue. However, her first effort with this failed a leaching test. She had a secret weapon: An account at Insight-live.com, where recipes and their calculated oxide formulas can be compared side-by-side. Leaching glazes are most often runny because they contain excessive fluxing oxides. She simply increased the SiO2, it is the glass that makes up the lion's share of all glazes (higher amounts of it characterize glossy glazes). Al2O3 couples with it to improve durability (and the Si:Al ratio is a factor in the degree of matteness). With an accompanying small increase in the B2O3, the magic glass:flux that makes most cone 6 glazes possible, the got the result on the right. The good news: It passed the GLLE test for leaching. There is a lesson here: She had to compromise the degree of matteness a little to get the food safe product. A benefit is that it is also less prone to cutlery marking. Happily, it turned out that much less blue stain was needed. Context: G1214Z1, G1214Z matte glaze melt.. Friday 7th March 2025 SignUp For Monthly Tech-Tip EmailPlease visit https://digitalfire.com and use the Register feature at the top of the page. No art or sales language, no tracking and no ads. To find past posts please use the search bar on this page. |
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