John Post on sun 14 aug 11
Hi Ron,
I have a variation of this glaze with 1.5% copper carb in it that has
passed the vinegar test and is doing fine in our dishwasher. I have
not sent any variations of this glaze in for lab testing yet. I
discovered the base for this glaze when I ran an Ian Currie grid of
Glossy Base 1 from your book. It was glaze #17 from that grid.
http://www.johnpost.us/Pottery%20Links/grid-glazes/glossy-base-1.html
I have never had much luck with any of the glazes from Mastering Cone
Six Glazes. My firing schedule is a bit different than the one listed
in the book. Instead of having several different slow cool firing
schedules, what I have chosen to do is stick with one schedule and
develop glazes that work with it.
I do this by running an Ian Currie grid of any glaze that I am
thinking of exploring. This lets me see a wide range of alumina and
silica values in relation to the fluxes. What I have discovered over
the years is that the flat Currie grid tiles do not tell the whole
story. Because of this I dip a test tile of each glaze on the grid.
Based on the flat grid tile for Glossy Base 1, I thought glaze 13 was
going to be the most promising. But based on the vertical test tiles,
glaze 17 looked the best.
One of the most interesting things for me about the Currie grids is
the way small changes in alumina and silica can create significant
changes in the visual appearance of a glaze.
John Post
Sterling Heights, Michigan
http://www.johnpost.us
Follow me on Twitter
https://twitter.com/UCSArtTeacher
On Aug 13, 2011, at 4:25 PM, Ron Roy wrote:
> Hi John,
>
> Looks good John - not a lot of SiO2 - do you know if it's stable?
>
> RR
>
>
> Quoting John Post :
>
>> I was working with some colorant variations in a base glaze and by
>> fortuitous accident created a glaze that resembles the famous
>> floating
>> blue. It looks best fired in oxidation on an irony brown clay body
>> at
>> cone 6. If your glaze recipe collection won't feel complete without
>> this new floating blue variation, you can get it here...
>>
>> http://www.johnpost.us/Pottery%20Links/My%20Clay%20Work/posts-floating-b=
lue.html
>>
>> John Post
>> Sterling Heights, Michigan
>>
>> http://www.johnpost.us
>>
>> Follow me on Twitter
>> https://twitter.com/UCSArtTeacher
>>
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