So, if I understand this, all of the rock hard bags of soda ash sitting on our shelves, I could pop back in the oven (smashing first with large hammer ) and re-constitute it? Probably wrong word but you know what I mean........
Really, Really Basic QuestionSoda Ash
Posted 31 August 2013 - 06:18 PM
After getting it ground back to a powder, you could bake it at 350 degrees for 1 hour or until offgassing stops. It would be Sodium carbonate again... yes.
Posted 31 August 2013 - 07:33 PM
I believe there are several books that list common, house-hold alternatives/substitutes for glaze chemicals. I've also noticed many terra sig recipes that call for the use of Calgon . . . although I suspect those were developed before the recent changes to Calgon.
Posted 02 September 2013 - 07:48 AM
This paper on the chemistry of the reddish markings on some traditional Japanese pottery
may be of interest to a few readers of this thread, as it relates to the use of alkali metals to
colour a clay body.
BTW potassium chloride forms the basis of many lo-sodium salt substitutes.
Posted 06 September 2013 - 06:26 AM
You might also try adding borax to your mix, hopefully the boron will reduce the temperature
needed to produce effects (if that is a problem for you).
I attach a couple of entries from an old clayart posting at http://www.potters.o...bject14497.htm/
Peter Atwood on tue 12 jan 99
Got yet another question for you. I recently tried for a soda effect on a small bisqued test pot
by brushing a mixture of soda ash and water onto the pot. I used white stoneware so that I could
really see the final effect and applied the mixture liberally. Then I fired to ^10R.
The result was this: Shiny dark orange flashing on some areas, pale shiny finish on others, and
crusty yellowish barnacle-like blisters on the rest. The inside seemed to have burned away
completely and left nothing but bare clay.
I'd like to achieve a controlled orange flashing effect. Is there something else I could try to get this to
happen? Even if the flashing is sporadic, is there a concoction that will at least be devoid of blisters?
Any suggestions would be much appreciated.
Sharon Pollock-De Luzio on fri 15 jan 99
Try dissolving the soda ash very well with hot water and spray it on the pots. I have used a regular water
bottle sprayer. With trial and error you can learn to control this quite well. WORD OF CAUTION: soda ash
is very caustic. Wear respirator, gloves, eye protection, long sleeves.
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