Glaze Tests

For this assignment, the objective was to research two glaze recipes on Glazy to use on our future projects and then create them. Having mixed glazes before, the process wasn’t new to me, but it was an experience to test recipes that I found on my own.

• *All recipes featured can be found by clicking on the links.
• *All recipes/materials are batched to 100 grams.

Recipe #1: Hersch Gold/Ochre

Created and tested by Sharon Miranda, this earthenware overglaze is able to be fired between Cone △05-03. With a semi-matte surface, it has a rich gold appearance that applies very well. From the test result, it was also no evidence of running, a factor that must be considered when finding a proper glaze.

The image depicted below was fired at Cone △05. Different from the Cone △04 example in the recipe’s webpage, my test tile was much paler than its counterpart, closely matching a cream color.

Materials: Silica (30.99g), Gerstley Borate (27.98g), Whiting (14.74g), Lithium Carbonate (7.73g), Nepheline Syenite (7.73g), Yellow Iron Oxide (7.10g), EP Kaolin (3.73g)

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Recipe #2: Watercolor Blue/Green

Produced by Austin Geithner, this high fire overglaze is made for specific clay bodies like porcelain and stoneware. Fired within Cone △6-11, this recipe turned out to be unusable as it ran heavily. Depending on the type of work it is applied to, it might be very interesting if its characteristic is taken into consideration. If the glaze can collect someplace such as the inners of a bowl or pot, an aesthetic could improve significantly if that is what the artist wishes for.

As shown, the glaze holds a multitude of cool colors like dark turquoise, sea green, and navy. These hues seem to follow a certain pattern as the brighter colors emerge at the center of where the test tile was dipped, then getting darker as the liquid ran down the sides. The surface itself is thick and glossy.

Materials: Custer Feldspar (45.23g), Whiting (15.49g), Silica (14.63g), EP Kaolin (7.36g), Strontium Carbonate (6.49g), Gerstley Borate (4.3g), Copper Carbonate (6.02g), Cobalt Carbonate (0.48g)