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Manganese is the new Cobalt. Haha. Ok, maybe I can't back that up at all… but there have been some killer iridescent glazes (@lisazolandz) showing up in my feed lately! @ceramicmaterialsworkshop just posted a sweet tile with a manganese crystalline glaze today. They've got me thinking back to the scanning electron images I took back in grad school at Utah State. Here's one from my vault. It's a 5000x zoom in of a manganese crystal nucleus. Pretty wild, eh? If memory serves, this glaze was a variation of David Shaner's glaze, which was given to my by John Tilton. 68% Custer, 2% EPK, 27.5 Manganese Dioxide, 2.5% Granular Manganese. . . _________ #manganese #glazetests #research #art #ceramics #glaze #SEM #porcelain #microscope #clay #mn #kiln #crystal #firedinaskutt #testing #ceramicglaze #artistsofinstagram #science #element #ceramicart #crystalline #glazerecipe
A post shared by Matt Fiske Ceramics (@bluepotter) on
For those of you who are really interested in Oil Spots, there’s an article from 2014 that I think is worth a long look. This particular article was what got me interested in SEM microscopy when I was in Grad School:
Ancient Jian wares are famous for their lustrous black glaze that exhibits unique colored patterns. Some striking examples include the brownish colored “Hare’s Fur” (HF) strips and the silvery “Oil Spot” (OS) patterns. Herein, we investigated the glaze surface of HF and OS samples using a variety of characterization methods. Contrary to the commonly accepted theory, we identified the presence of ε-Fe2O3, a rare metastable polymorph of Fe2O3 with unique magnetic properties, in both HF and OS samples. We found that surface crystals of OS samples are up to several micrometers in size and exclusively made of ε-Fe2O3. Interestingly, these ε-Fe2O3 crystals on the OS sample surface are organized in a periodic two dimensional fashion. These results shed new lights on the actual mechanisms and kinetics of polymorphous transitions of Fe2O3. Deciphering technologies behind the fabrication of ancient Jian wares can thus potentially help researchers improve the ε-Fe2O3 synthesis.