Using Wood Ash Spray In Ceramic Firing

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You can build a simple raku kiln and fire your work with wood to get stunning results.

Using wood ash spray in ceramic firing.

Lately i have read short descriptions of people using soda ash wash on their bisque fired pieces prior to glaze firing and have several questions. The process that i m talking about is wood firing with salt thrown in. The work in wood kilns reveals the story of the firing with pieces showing ash deposits and the path of the flame through the kiln. I remember visiting a well known pottery in japan renowned for its wood fired pots and seeing a woman swathed in indigo cloth spraying wood ash in a fairly thick coating onto the pots.

The ash from the wood was coating the bricks adhering and melting as a thin layer of glaze. Does it have detrimental effects on your elements or bricks in an electric kiln. Is it only used on bare bisque fired clay or can it be used over a glaze coat under a glaze coat or over underglazes. While wood kiln firing isn t easy the results are incomparable.

This complex interaction of ash salts minerals in the clay and the flame itself are what give wood fired pots their unique characteristics. I only mix up what i ll use in one firing 1000 grams of each since the ash glaze does not store well. The minerals from the wood are restored to nature where they can be reused again. Traditionally ash glazes were fired between cones 9 and 10.

Using up wood ash in your yard and garden is a natural solution. It requires a very hot dirty firing to look good but also it holds up well in multi day super hot wood kilns. Now with so many fuel options available to the potter wood fired kilns are more of a choice than a necessity. Wood ash contains all the trace minerals from inside a trees wood which are the building blocks needed for plant health.

After mixing with water run the glaze. Used as very thin wash dipped brushed or sprayed over shino this mix promotes carbon trapping and can give the look of wood firing. Wood ash is caustic so work in a well ventilated area with a respirator and wear safety goggles and chemical resistant gloves. The japanese have always held wood fired ceramics in high esteem wood kilns can not only produce temperatures of 1400 c 2 500 f wood fires also produce fly ash and volatile salts.

Salt vaporizes at a fairly low temperature and can work its way into all sorts of nooks and crannies. But not all wood kilns are built. At this temperature the ash will easily melt and the result to the non purist is almost indistinguishable from pottery fired in a wood firing kiln. The next step is to weigh equal amounts of ash and redart clay.

Putting one and one together the potters discovered that wood ash with very little else added forms a glaze. In a salt firing the salt vaporizes and the sodium chloride splits into sodium and chlorine gas. The salt easily glosses up a piece and helps the wood ash flux out. Yard garden uses for wood ash.

So check out nesrin s post today.

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