© 2020 by Alison Thyra Grubb

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Phase 1 glaze testing


Last week I made a huge batch of flat test tiles for the first phase of glaze testing that I would like to carry out this semester. I'm hoping that making a large batch and having them bisque fired and ready to glaze will speed up and streamline the testing process for me.


In Stage 3 I did a lot of lustre glaze testing and though I discovered many lustre colours I think my tests were a bit all over the place and I could potentially find variation in colours and iridescence if I carry out more systematic testing. I've been reading Greg Daly's book 'Developing Glazes' and I think using systems for glazing is the best way for me to find a range of colours and combinations using the oxides that I already know can develop into a lustre glaze. I never got the chance to test every combination of these oxides and I think there's potential for me to have a full range of colours.


I plan on using a series of single and double line blends in my base glaze using the same 6 oxides I tested in Stage 3. I also would like to test tin oxide because I got a beautiful pale yellow mother of pearl glaze late last semester using tin so I hope I could have similar results when combined with my other oxides. I will also test triaxal blends using 3 additives to help me better understand what different oxides will do together. I had a test using 3 additives come out last semester that was partially a red lustre but didn't fully reduce, it perhaps had too much cobalt in it, so I would like to refine this testing further.


The next phase of testing will use more 3-dimensional test pieces so I can test the best of the lustre glazes from the phase 1 tests and see how they react and reflect light in a vessel shape.