[Clayart] Shino and Spodumene

vpitelka at dtccom.net vpitelka at dtccom.net
Tue Jan 4 13:23:16 UTC 2022

Hi Robert - 
You give me credit for knowing more than I do.  I know a lot, but when I make a mistake or unintentionally post misleading information on Clayart, someone responds expressing surprise and implying that I should have known better.  I appreciate their confidence in me, but I'm only human.  I remember one of those silly placards pinned up in offices that said, "To err is human.  Must you be so human?" 

I guess I don't have any Japanese shino recipes.  I checked all my shino recipes and they all contained spodumene.  I'll look into this further, because I'd like to introduce more shinos into my soda firings.   I might even be able to do it without any American affectations.
- Vince

Vince Pitelka
Potter, Writer, Teacher
Chapel Hill, NC
vpitelka at dtccom.net

-----Original Message-----
From: Clayart <clayart-bounces at lists.clayartworld.com> On Behalf Of Robert Harris
Sent: Monday, January 3, 2022 9:02 PM
To: Clayart international pottery discussion forum <clayart at lists.clayartworld.com>
Subject: Re: [Clayart] HAPPY NEW YEAR CLAYART

Come on, Vince, sometimes you say things that are truly puzzling.

No Japanese shino (you know, actual real shinos) has spodumene in it (as far as I am aware).

Spodumene is an American affectation. Pretty much the only reason it's included is to reduce the amount of crazing that's induced by the soda ash (which again is an American affectation). Low melt spodumene (which was really amblygonite) was handy because of its low melting point, but that hasn't been available for years. I bet you could replace spodumene with NephSy and some kaolin, you'd just have to put up with more crazing.

I wonder if you could replace the soda ash with borax if the crazing is bothersome. It would almost certainly alter the results somewhat, but it would allow the techniques that use the solubility of soda ash to decorate pots.
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