[Clayart] Line blend shortcut: Is the "fast five" good enough?

[Dannon Rhudy]

Usually a "fast five" will get you close to where you want to be.
Iron reds are tricky, though. Glad to see you're firing in oxidation,
because I have found that iron red needs no reduction at all. 

Whatever kind of  tests you do, it really won't take much time. So five or
10 either one should tell you what you want. I have found bone ash to be
the critical ingredient in iron reds. 

regards 

Dannon Rhudy

-----Original Message-----
From: Clayart [mailto:clayart-bounces at lists.clayartworld.com] On Behalf Of Bob Johnson
Sent: Friday, February 17, 2017 3:14 PM
To: Clayart international pottery discussion forum
Subject: [Clayart] Line blend shortcut: Is the "fast five" good enough?

I'm having trouble with my iron reds, which generally come out a deep maroon, rather than a ... well, iron red. I gather that I probably need to do a line blend, to see whether my RIO is the right strength. But here's what I want to know: Is Diana Pancioli's "fast five" test good enough, or do I need to do one percent increments, say from 1 to 10 percent RIO?

FYI, I'm firing in an oxidizing atmosphere in a gas kiln, with a half-hour soak at about 1800 degrees, at the end. The clay is B-Mix or the equivalent from another manufacturer.

Thanks!

Bob
--in southern Oregon
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