slope matters
Nov 12, 2017 11:43:00 GMT -6
Post by Arnie Benton on Nov 12, 2017 11:43:00 GMT -6
I haven't posted in awhile - here's my latest. Not spectacular like Mariscal's, but more subtle.
I work with horizontal surfaces - I've been doing crystalline glazing for about 10 years and have never used a pedestal - actually I did once - glazing only the inner surface of plates and bowls. The degree of slope is of great importance for the development of crystals - most of my work has been with very shallow bowls with what I call a gentle slope - I can't define it exactly, but I don't get any pooling at the bottom - it's that gradual a slope -
In my last firing I tried some different shapes - subtle changes from my usual but with major differences in the results.
Here's my usual shallow bowl -
and here's the same glaze in the same firing with a rimmed shallow bowl -
another example - shallow bowl
and with a rimmed bowl -
and the last example - usual shallow bowl
and same glaze on a square plate - flat bottom
If the slope on my usual shallow bowl is a 'gentle slope', then the slope on the rimmed bowl is closer to flat and the slope on the square IS flat.
The differences in the crystals is much more dramatic than seems justified by the amount of change in the slope - but it's real.
I try to put the same amount of glaze, 0.35gm of dry glaze per square inch, on each piece.
With all the variables involved in producing crystals, add the slope of the surface. On horizontal surfaces, flat is much different than the slightest slope, which is different from the 'gentle slope'. And, of course, greater sloped sides to bowls will be even more 'different'.
Arnie
I work with horizontal surfaces - I've been doing crystalline glazing for about 10 years and have never used a pedestal - actually I did once - glazing only the inner surface of plates and bowls. The degree of slope is of great importance for the development of crystals - most of my work has been with very shallow bowls with what I call a gentle slope - I can't define it exactly, but I don't get any pooling at the bottom - it's that gradual a slope -
In my last firing I tried some different shapes - subtle changes from my usual but with major differences in the results.
Here's my usual shallow bowl -
and here's the same glaze in the same firing with a rimmed shallow bowl -
another example - shallow bowl
and with a rimmed bowl -
and the last example - usual shallow bowl
and same glaze on a square plate - flat bottom
If the slope on my usual shallow bowl is a 'gentle slope', then the slope on the rimmed bowl is closer to flat and the slope on the square IS flat.
The differences in the crystals is much more dramatic than seems justified by the amount of change in the slope - but it's real.
I try to put the same amount of glaze, 0.35gm of dry glaze per square inch, on each piece.
With all the variables involved in producing crystals, add the slope of the surface. On horizontal surfaces, flat is much different than the slightest slope, which is different from the 'gentle slope'. And, of course, greater sloped sides to bowls will be even more 'different'.
Arnie
