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docweathers

Member Since 30 Jul 2011
Offline Last Active Yesterday, 01:04 AM
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Topics I've Started

Robin Hopper's Mocha Diffusion-Base Slip

17 December 2014 - 06:43 PM

in the article of Robin Hopper demonstrating mocha diffusion, he gives the following formula for his base slip.

 

Feldspar       5%

Ball Clay     75%

Kaolin         10%

Silica           10%

 

 

does anyone know what kind of feldspar,and  ball clay, one should use?

 

Also I'm trying to get mocha diffusion to work and having very little success

 

  I read a number of descriptions, including Robin's on the web. However, I'm not having any luck getting the dendrite pattern. I have a lot of things and nothing seems to make much difference. 
 
This is what I've tried:
 
1. Slip made of Tennessee ball clay
2. One of Robin Hopper's diffusion slip: (ball 75, spar 5, silica 10, epk 10) plus I add 5  3134 and 10 RIO
3. adding hardwood ash, or sodium silicate, or Calcium nitrite, or amonia to the above slips
 
I've used thick and thin solutions of cobalt carbonate and ordinary vinegar or apple cider vinegar.
 
I've tried using in both horizontally and vertically on my leather hard G6 mix clay.
 
The very best I've done is to get some almost microscopic dendrites on the edge of my dribbles.
 
I would appreciate any advice or guidance you can give me in debugging this.
 
Thanks
 
Larry

Stephen Hill Firing Schedule

24 April 2014 - 04:44 PM

One unique feature of Stephen Hill's firing schedule is that he goes to someplace in ^ 5 then holds for up to an hour until the ^ 6 drops.  what is the point of this versus simply going to cone 6?


De-Airing Pugmill Design

09 March 2014 - 07:16 PM

I'm about to convert my non-de-airing pug mill to de-airing. all of the designs that I have seen use  wire mesh  across the path of the clay to shredded into spaghetti. Is anyone aware of any other design for a de-airing pugmill?


Refiring ^ 6 Stoneware At ^06

20 February 2014 - 12:14 PM

I've noticed that some people are getting some very nice results by refiring ^ 6 stoneware at ^06. Often the colors are are richer and more variegated.

 

Is there any logic to when this works and when it doesn't?


Substitute For Johnson Matthey Frit 623

18 February 2014 - 05:18 PM

what frit available in the US would be a good substitute for Johnson Matthey Frit 623.  digitalfire lists it but doesn't offer a substitute