The ash from the wood was coating the bricks adhering and melting as a thin layer of glaze.
Using wood ash spray in ceramic firing.
Putting one and one together the potters discovered that wood ash with very little else added forms a glaze.
The next step is to weigh equal amounts of ash and redart clay.
In a salt firing the salt vaporizes and the sodium chloride splits into sodium and chlorine gas.
Traditionally ash glazes were fired between cones 9 and 10.
Wood ash is caustic so work in a well ventilated area with a respirator and wear safety goggles and chemical resistant gloves.
It requires a very hot dirty firing to look good but also it holds up well in multi day super hot wood kilns.
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 work in wood kilns reveals the story of the firing with pieces showing ash deposits and the path of the flame through the kiln.
But not all wood kilns are built.
Jennifer poellot harnetty editor.
Used as very thin wash dipped brushed or sprayed over shino this mix promotes carbon trapping and can give the look of wood firing.
After mixing with water run the glaze.
Using up wood ash in your yard and garden is a natural solution.
Shino ash wash from sylvia dales 70 potash feldspar g 200 30 wood ash bentonite 2.
I only mix up what i ll use in one firing 1000 grams of each since the ash glaze does not store well.
Salt vaporizes at a fairly low temperature and can work its way into all sorts of nooks and crannies.
The salt easily glosses up a piece and helps the wood ash flux out.
Now with so many fuel options available to the potter wood fired kilns are more of a choice than a necessity.
The minerals from the wood are restored to nature where they can be reused again.
Does it have detrimental effects on your elements or bricks in an electric kiln.
So check out nesrin s post today.
This complex interaction of ash salts minerals in the clay and the flame itself are what give wood fired pots their unique characteristics.
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.
The process that i m talking about is wood firing with salt thrown in.
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.
Nesrin during shows us how to combine wood firing and raku firing as you ll see wood firing isn t just about high firing.
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.
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.
Yard garden uses for wood ash.
