John Britt's new cone 4-7 glaze book

[Carl Ray Crutchfield]

Received John Britt's The Complete Guide to Mid-Range Glazes for Christmas - fabulous book and have been enjoying it immensely.  If you have a copy, I have a question.  -  On pg 116, he speaks of making blue glazes by adding stains to a celadon base and on pg 117 shows three tiles (6,7,8) using a glaze called Chun Clear.  Question - Is that the glaze given on pg 81 and called Chun?  If so, would the colorants listed in the glaze recipe (copper carbonate and cobalt carbonate) be left out of the glaze mix to get Chun Clear?  I could not find another reference to Chun Clear in the Index.  Thanks for any help in understanding. 

[Cyndy Littleton]

I just ordered the book and am looking forward to utilizing it.

I have a recipe from a friend called Chun Clear. How does it compare to the glaze on page 81?

It is:

F4 Soda Feldspar     38

Whiting                    14

Zinc Oxide               12

Ball clay                    6

Silica                       30

[Carl Ray Crutchfield]

exactly the same except chun on pg 81 calls for kaolin instead of ball clay and there is an addition of 0.3 copper carb and 0.3 cobalt carb.  The addition of the carbonates and the fact that the chun on pg 81 is in the list of oxidation celadons makes me think that leaving out the carbonates would be a clear chun.  Sounds like the kaolin is a purer form of clay than the ball clay, but perhaps the ball clay and kaolin are interchangeable in this instance.  I will have the coop studio where I work make up a small batch and see what I get.  Thanks for the input.

[George Lewter]

I seem to recall a couple of internal references in the book that were hard to follow. With the sheer number of recipes and the extensive commentary concerning various artists results, it is perhaps inevitable that linkages here and there could be missing or unclear. 

[Carl Ray Crutchfield]

Agreed, George. It is an incredible piece of work and I am really enjoying it.