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Creating a white-on-black oil spot glaze effect at cone 6 oxidation
Super gloss, gloss and matte black glazes for cone 6. Each is made by adding a black stain to an existing recipe (or recipe blend) already working well on our clay bodies.
G2926B Cone 6 Gloss Black
Total:106.00 Notes *This is based on G2926B, our standard transparent glaze for cone 6. We have made this for many years and are confident of its durability and safety (it has the maximum SiO2/Al2O3 possible for the gloss and is made from safe materials sourcing safe oxides). As of 2021 we are beginning to use 45 micron silica and Fusion Frit F-12 instead of Ferro 3134). Both of these changes appear to have improved the glaze, making it more melt fluid and of lower thermal expansion (likely because the silica is going into solution in the melt better). Pictures G2926B Black vs. Low Fire black While G2926B Black looks impressive at first, when you hold it beside a low temperature glossy black (like Spectrum one) it is not as good. Ball milling would improve that. A stunning contrast between matte and gloss blacks The clay is Plainsman M370. Fired at cone 6 using the PLC6DS drop-and-hold firing schedule. The inside glossy glaze is G2926BL. The outside glaze base is G2934BL matte. Both recipes contain 6% Mason 6600 black stain. G2934BL is tricky to keep consistent because the matte surface is a product of both the chemistry and the firing schedule. Thus we faced lots of testing when it became necessary to substitute Ferro Frit 3124 for the supposed equivalent, Fusion Frit F-19. Early results showed a little better melting, so the 10-15% glossy we normally add to move the stoney matte toward satin is not needed. However, we still made an 85:15 batch for our more frequent slow-cool C6DHSC firings (otherwise this G2934 mug would have fired too matte). So with the two recipes and two schedules I can produce four surfaces, from gloss satin to stony matte. Which black base layer produces the best oil-spot effect? G3912A on G2934Y, G2926BL, G3914A blacks at cone 6. Clearly this white is sensitive to the black glaze it is on. It produces the best oil spot effect on G3914A. G2926B Black vs. G3914A Black Left half: G2926B with 6% Mason 6600 stain. Amaco Obsidian vs G2926BL The obsidian is bluer, more transparent, not as black. XML (to paste into Insight) <?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="G2926B Cone 6 Gloss Black" id="191019" key="uZ58qJtP" date="2023-06-27" codenum="G2926BL"> <recipelines> <recipeline material="G2926B Clear Glaze" amount="100.000" tolerance=""/> <recipeline material="Mason 6600 Black Stain" amount="6.000" tolerance=""/> </recipelines> </recipe> </recipes> Born: 2021-02-03, Modified: 2023-06-27 13:04:42 |
Alberta Slip Gloss Black
Total:104.00 Auto Unity Formula
Notes *This black employs the proven Alberta Slip GA6-B base. This produces a slightly variegated surface (it glistens in the light). Since Alberta Slip is a natural material and contains significant iron already, a jet-black glaze is produced with only a 4% stain addition! Pictures Three cone 6 black glazes Left: 2926B black (mislabelled as 2917F) G3914A 3% stain with G3912A - 6% tin G3914A black with G3912A overglaze - 4-7% tin The first black one (with 4% tin overglaze), only has 3% black stain. Which black base layer produces the best oil-spot effect? G3912A on G2934Y, G2926BL, G3914A blacks at cone 6. Clearly this white is sensitive to the black glaze it is on. It produces the best oil spot effect on G3914A. G3914A Black at cone 6 on M340 While only having 4% stain, the surface has a unique metallic and crystalline quality. The full effect requires ball milling. G2926B Black vs. G3914A Black Left half: G2926B with 6% Mason 6600 stain. G3914A on Coffee clay and M370 at cone 6 PC-20 over 14A (left) and C1 (right) The PC-20 is thinning the G2914A but it is bluer. G3914A vs Amaco C-1 Obsidian Black Needs more stain to equal the opacity. However this glaze features a microcrystallizing surface, especially on slow cooling, it is not likely a good candidate for more stain. Better to use the G2926B black. XML (to paste into Insight) <?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Alberta Slip Gloss Black" id="188926" key="yk8JkJwi" date="2023-06-23" codenum="G3914A"> <recipelines> <recipeline material="Alberta Slip" amount="40.000" tolerance=""/> <recipeline material="Alberta Slip 1000F Roasted" amount="40.000" tolerance=""/> <recipeline material="Ferro Frit 3195" amount="20.000" tolerance=""/> <recipeline material="Mason 6600 Black" amount="4.000" tolerance=""/> </recipelines> </recipe> </recipes> Born: 2020-11-17, Modified: 2023-06-23 11:48:54 |
G2934 85:15 Adjustable Matte Black
Total:106.00 Auto Unity Formula
Notes *Attractive black matte glazes are among the most difficult of all effects to produce. Even slight differences in the degree of matteness are noticeable. Cutlery marking is very visible when the surface is too matte. The key to success is adjustability, both in recipe and firing schedule (more info below). Pictures A stunning contrast between matte and gloss blacks The clay is Plainsman M370. Fired at cone 6 using the PLC6DS drop-and-hold firing schedule. The inside glossy glaze is G2926BL. The outside glaze base is G2934BL matte. Both recipes contain 6% Mason 6600 black stain. G2934BL is tricky to keep consistent because the matte surface is a product of both the chemistry and the firing schedule. Thus we faced lots of testing when it became necessary to substitute Ferro Frit 3124 for the supposed equivalent, Fusion Frit F-19. Early results showed a little better melting, so the 10-15% glossy we normally add to move the stoney matte toward satin is not needed. However, we still made an 85:15 batch for our more frequent slow-cool C6DHSC firings (otherwise this G2934 mug would have fired too matte). So with the two recipes and two schedules I can produce four surfaces, from gloss satin to stony matte. Which black base layer produces the best oil-spot effect? G3912A on G2934Y, G2926BL, G3914A blacks at cone 6. Clearly this white is sensitive to the black glaze it is on. It produces the best oil spot effect on G3914A. Black matte mixed July 2021 Starting in June 2021 we are switching to Fusion Frits. This batch was made using Fusion Frit F-19 and 45 micron silica. The upper pail is 85:15 Matte/Glossy mix, the lower one G2934 only. G2934 black vs. G2934:G2926B blend black Left is G2934 with 6% Mason 6600. Too matte for most people. Right is 85:15 G2934:G2926B with 6% stain. In this C6DHSC firing is has the degree of matteness that we like. G2934Y and G2934 Black - Fast cool If G2934Y is slow cooled it looks like G2934 fast cooled. Untitled G2934BL brush on version Four coats. Works very well. XML (to paste into Insight) <?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="G2934 85:15 Adjustable Matte Black" id="191021" key="58L5qd2y" date="2024-10-02" codenum="G2934BL"> <recipelines> <recipeline material="G2934" amount="85.000" tolerance=""/> <recipeline material="G2926B" amount="15.000" tolerance=""/> <recipeline material="Mason 6600 Black Stain" amount="6.000" added="true"/> </recipelines> </recipe> </recipes> Born: 2021-02-03, Modified: 2024-10-02 23:24:00 |