Comment

Comment by Norm Stuart on April 7, 2015 at 5:05pm

Found it and added it.  Thanks Jeff.

The glaze is really not so much a white as a calcium semi-matte, made even more white and opaque from the magnesium in the Dolomite.

Probably like the calcium semi-mattes from "Mastering Cone 6 Glazes", the glaze is fairly stiff so won't interact much with a more fluid glaze layered over it - so an ideal ceramic canvas gesso.

I've found putting down a layer of a ^6 glaze like this can make leaded manganese gold ^06 glazes turn really metallic and lustrous as they provide a platform and seal the low fire glaze off from the clay body.

Comment by Jeff Poulter on April 7, 2015 at 2:26pm

Hi Norm,

    If you do a search on this website for "tabletop", it will pull up Donna's post with the pic at the top.  jhp

Comment by Norm Stuart on April 7, 2015 at 10:54am

A photo of Donna's Matte White with just another glaze on the rim would be perfect.

Comment by Jeff Poulter on April 7, 2015 at 10:30am

I think attaching those photos is misleading as they were layered with other glazes.  There are pics of Donna's White Matt with just another glaze on the rim that would represent the glaze by itself.  jhp

Comment by Norm Stuart on April 6, 2015 at 11:03pm

I've added this recipe to the Insight-Live database as Donna's Matte White, and a complex version without Cornwall Stone, both recipes with your credited photos, s'il vous plaît.

Since there's no addition of tin or zircopax, I assume the white color comes from the calcium-magnesium of the Dolomite.

Comment by Jeff Poulter on April 6, 2015 at 3:08pm

So just to clarify, the recipe in the previous post is for Obsidian. I did some hunting & found Donna's White.  I call it Donna's White cause it cam e from Donna F, but in reality she just calls it Matt White.  It's posted below.  I don't know if it is already in the database.  

matte white

Cornwall stone        21%

Ferro 3134              22%

Dolomite                21%

Om4 Ball Clay         15%

Flint                       20%

_______________________

                            99%

bentonite                  2%

this is a flat matte white glaze, smooth surface,my experience has been firing it from cone 5-6 1/2 with good results

for colors add

.50% periwinkle blue

4% rutile for a semi matte white, that breaks over dark clay nicely

4% CuCO3 for a copper matte

3% RIO, 1.75% CuCO3, .375% magansese dioxide, .50% rutile for a mustardly brown green

Comment by Jeff Poulter on April 4, 2015 at 10:48pm

I just checked Eric Preece's blog and what I found was 75 % Alberta, 25 % 3134 & 5 % Cobalt Oxide   jhp

Comment by Jeff Poulter on April 4, 2015 at 10:44pm

I thought it was already there.  I know its on the site cause that's where I got it from.  It came from Donna Ferrera.  I thought she had put it in there.  Frogskin is in there as it came from Kathy Ransom.  Obsidian came from a guy that used to be on here but I don't think he has been for quite awhile.  I think Obsidian is 80 % Albany or a reasonable facsimile thereof, 20 % GB and 5 % Cobalt Oxide....  I'll have to check for sure.  jhp

Comment by Norm Stuart on April 4, 2015 at 10:35pm

Very nice Jeff. Do us all a favor and add the recipe for "Donna's White" to the Insight-Live glaze database.

Or email me the recipe and I'll add the recipe.

Comment by Jeff Poulter on April 4, 2015 at 10:22pm

Or Frogskin over Donna's White.....   There are so many glazes that layer very well over Donna's White!  jhp

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