A matte that is matte because it is not melting completely

Thursday 30th October 2014

Left: This specimen of VC71 cone 6 matte glaze was felt-marked and cleaned with acetone. A closeup of the ink specks reveals they are held in micro-bubbles breaking at the surface. This specimen has also been thermally stressed in a 300F/ice-water IWCT test (causing the crazing pattern, which curiously, only shows up on part of the surface).
Right: An adjustment to VC71 that adds more boron and Al2O3/SiO2 (while preserving the Si:Al ratio). It is much glossier, confirming that, even though the VC71 matte surface feels functional to the touch, it is a product of improper melting.

Pages that reference this post in the Digitalfire Reference Library:

Matte Glaze, Glaze Bubbles, Functional

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