Hot Crystalline Glaze -- Time-Lapse Growth Sequence

This hot photo sequence shows the progressive growth of glaze crystals on the molten surface of a zinc silicate glaze fired to 1240 centigrade and then cooled to 1140 C for crystalline development. This glaze example is based on a variation or a formula published in Fara Shimbo's book Crystal Glazes. The 1st image shows the camera lens pre-focused on a cloth tape on top of the raw glaze before the kiln heat cycle was started. All of the 1140 degree images show the dark red molten circle of glaze which has flowed from the bowl rim to collect as a pool at center. The smaller darker red shadow at the red pool center is the reflection of the forward end of the imaging lens which is sitting outside the kiln top but centered on the lid imaging port. All images show only the part of the bowl visible through the 2 inch diameter imaging hole in the kiln lid. All images are taken with the lens in the vertical plane and pointed at the bowl center. The rim of bowl is outside of the imaged field and therefore does not appear in the images. This short sequence of hot images were taken at 30 minute intervals from 2 hours to 3.5 hours at at 1140 degrees centigrade. In other words--the 4 orange / yellow hot images were all taken at 1140 degree C at 30 minute intervals. This particular glaze ramp was cooled from 1240 degree top temperature and then cooled to 1140 with no other variation in kiln ramp. This glaze recipe shows fairly rapid crystalline development compared to other crystalline glaze formulas. The cooling ramp was not controlled but at the normal cooling associated with this particular kiln. The final hot sequence at 900 degree C begins to display the true cobalt carbonate color of the glaze. Final shots show the complete bowl. This example was fired in a Quad version of L & L Baby Doll test kiln which Stephen Lewicki kindly built for my application.

[@kubakalinowski8032]

Super!

[@MattyJames]

so cool Dan

[@hinternsaubachel5109]

Quality