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Using wild ocean clay (salt!)


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FromDigitalfire's page on efflorescence  https://digitalfire.com/glossary/efflorescence
Soluble salts can also be removed by slurrying a clay using excess water, allowing it to settle and pouring off the stained water (and repeating as necessary).

I'm dubious about the advice because of the potential loss of "fines". What do others think?

 

Edited by PeterH
finger trouble
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I would definitely be concerned about the salts damaging the inside of the kiln. I would also be concerned about how it affects the clay. Typically, soluble materials are not wanted in a clay body. It will likely affect the workability of the clay as well as how it fires.

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Alright thank you! Alas, I also think so. I read that the salt can react in a pretty undesirable way and even make the fume more toxic.

I was also a bit unsure what happens if I just water it out: would I just sit back with fine sand, basically? But I will try and I will fire it in my almost broke outdoor kiln and see:)

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1 hour ago, petrichor said:

Alright thank you! Alas, I also think so. I read that the salt can react in a pretty undesirable way and even make the fume more toxic.

I was also a bit unsure what happens if I just water it out: would I just sit back with fine sand, basically? But I will try and I will fire it in my almost broke outdoor kiln and see:)

 You can do a sedimentation test by shaking up your clay/soil with water and letting it settle, the different sizes of particle separate out into layers:
images?q=tbn:ANd9GcSiRE6dz_3dJXLiuJ5lIgB


This is a variation on the theme, separating the clay from any sand (and washing it the process).
Processing Clay the Easy Way: Water Extraction
http://www.practicalprimitive.com/skillofthemonth/processingclay.html

 

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