John Rodgers on sat 10 nov 07
I have been doing some test glazes - new glazes entirely, mixes of old
glazes and new, and layering of one glaze over another. Results have
been interesting, but one was outstanding. It came about as the result
of layering Chrome Tin Red over MC6 Floating Green on C5 B-Mix. The
result was so striking, that I decided to play with a specific glaze for
the color. I began by comparing the ingredients of Chrome Tin and MC6
Floating Green and found they both had the same chemicals - only the
amounts varied a bit. The one thing that the MC6 Floating Green had that
the Chrome Tin didn't was Cobalt Oxide. I decided to go with the Chrome
Tin and added 1% Cobalt Oxide. When applied by dipping, the results was
a stunning solid purple ever so slightly on the lavender side. I'm sure
that by varying the amount of cobalt just a tiny bit, one could go a
brighter lavender, or a darker purple. But the combination of tin,
chromium, and cobalt seems to produce a good solid color rather than the
multiple colors of the straight chrome-tin combination. So if a solid
purple is your desire, you might try this.
Chrome-Tin Purple Glaze
Cone 5-6 (#5 witness cone bent to tip touching shelf in my kiln)
(as applied to C5 Laguna B-mix)
Gloss
Base Glaze-------
Silica (200) - 32%
Gerstley Borate - 21%
Calcium Carbonate (Whiting) - 20%
Nepheline Syenite - 16%
Edgar Plastic Kaolin (EPK) - 11%
Total: -100%
Colors ------red/pink/purple/mauve
Add:
Tin Oxide - 5%
Chromium Oxide - 0.2%
For a consistent solid purple with slight lavender hue -
Add:
Cobalt oxide - 1%
Notes: color and hue in the purple range can be varied by varying the
amount of Cobalt Oxide - your choice. Test, test, test!
Caution: Cobalt Oxide is slightly toxic until bound with glass formers..
Handle only with gloves and mask.
Regards,
John Rodgers
Chelsea, AL
Sabri Justin Douglas Ben-Achour on sun 11 nov 07
Hi Roger, thanks so much for sharing!
> Date: Sat, 10 Nov 2007 13:31:35 -0600
> From: inua@CHARTER.NET
> Subject: Chrome Tin Purple
> To: CLAYART@LSV.CERAMICS.ORG
>=20
> I have been doing some test glazes - new glazes entirely, mixes of old
> glazes and new, and layering of one glaze over another. Results have
> been interesting, but one was outstanding. It came about as the result
> of layering Chrome Tin Red over MC6 Floating Green on C5 B-Mix. The
> result was so striking, that I decided to play with a specific glaze for
> the color. I began by comparing the ingredients of Chrome Tin and MC6
> Floating Green and found they both had the same chemicals - only the
> amounts varied a bit. The one thing that the MC6 Floating Green had that
> the Chrome Tin didn't was Cobalt Oxide. I decided to go with the Chrome
> Tin and added 1% Cobalt Oxide. When applied by dipping, the results was
> a stunning solid purple ever so slightly on the lavender side. I'm sure
> that by varying the amount of cobalt just a tiny bit, one could go a
> brighter lavender, or a darker purple. But the combination of tin,
> chromium, and cobalt seems to produce a good solid color rather than the
> multiple colors of the straight chrome-tin combination. So if a solid
> purple is your desire, you might try this.
>=20
> Chrome-Tin Purple Glaze
> Cone 5-6 (#5 witness cone bent to tip touching shelf in my kiln)
> (as applied to C5 Laguna B-mix)
> Gloss
>=20
> Base Glaze-------
> Silica (200) - 32%
> Gerstley Borate - 21%
> Calcium Carbonate (Whiting) - 20%
> Nepheline Syenite - 16%
> Edgar Plastic Kaolin (EPK) - 11%
> Total: -100%
>=20
> Colors ------red/pink/purple/mauve
> Add:
> Tin Oxide - 5%
> Chromium Oxide - 0.2%
>=20
> For a consistent solid purple with slight lavender hue -
> Add:
> Cobalt oxide - 1%
>=20
> Notes: color and hue in the purple range can be varied by varying the
> amount of Cobalt Oxide - your choice. Test, test, test!
>=20
> Caution: Cobalt Oxide is slightly toxic until bound with glass formers..
> Handle only with gloves and mask.
>=20
> Regards,
>=20
> John Rodgers
> Chelsea, AL
>=20
> _________________________________________________________________________=
_____
> Clayart members may send postings to: clayart@lsv.ceramics.org
>=20
> You may look at the archives for the list, post messages, or change your
> subscription settings here: http://www.acers.org/cic/clayart/
>=20
> Moderator of the list is Mel Jacobson who may be reached at melpots2@visi=
.com
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Alisa Clausen on mon 12 nov 07
On Sat, 10 Nov 2007 13:31:35 -0600, John Rodgers wrote:
>
>Chrome-Tin Purple Glaze
>Cone 5-6 (#5 witness cone bent to tip touching shelf in my kiln)
>(as applied to C5 Laguna B-mix)
>Gloss
>
>Base Glaze-------
>Silica (200) - 32%
>Gerstley Borate - 21%
>Calcium Carbonate (Whiting) - 20%
>Nepheline Syenite - 16%
>Edgar Plastic Kaolin (EPK) - 11%
>Total: -100%
>
>Colors ------red/pink/purple/mauve
>Add:
>Tin Oxide - 5%
>Chromium Oxide - 0.2%
>
>For a consistent solid purple with slight lavender hue -
>Add:
>Cobalt oxide - 1%
>
>Notes: color and hue in the purple range can be varied by varying the
>amount of Cobalt Oxide - your choice. Test, test, test!
>
>Caution: Cobalt Oxide is slightly toxic until bound with glass formers..
>Handle only with gloves and mask.
>
>Regards,
>
>John Rodgers
>Chelsea, AL
>
Hi John
Glad to hear that your testing results were good.
Just for order sake, the recipe,
Floating Green
30 Neph Sye
21 G.B.
8 Whiting
10 Kaolin
31 Silica
ADD
2 Chrome
1 Cobalt
is not from MC6G but appears on John Hesselberth's website, Frogpond.
It has been tested and is in the archives. I happen to use it in big
batches and is always cosistent in cover and melt.
Raspberry, the chrome and tin glaze that is in MC6G has appeared in Clay
Times Jan/Feb. 05 issue,
ever so slightly adjusted with an additon of .60 Cobalt Carb.
The additves to the base were thus
0.2 Chrome
3.75 Tin
0.6 Co. Carb.
and produced also similar results to your description of your tests.
it was again written about on Clayart with the same base but now called
Raspberry Blue
with the
addtion of
1 Cobalt Carb.
0.25 RIO which for me, yielded a covering and streaky medium Blue.
one more time with the name
Raspberry Purple
with the addtion of
0.2 Chrome Ox.
7.5 Tin
1.0 Cobablt Carb
0.25 RIO
so, more you can test!!
Best regards,
Alisa in Denmark
John Rodgers on mon 12 nov 07
Alisa,
I'm gonna have fun with this!! :-)
John
Alisa Clausen wrote:
> On Sat, 10 Nov 2007 13:31:35 -0600, John Rodgers wrote:
> >
>
>> Chrome-Tin Purple Glaze
>> Cone 5-6 (#5 witness cone bent to tip touching shelf in my kiln)
>> (as applied to C5 Laguna B-mix)
>> Gloss
>>
>> Base Glaze-------
>> Silica (200) - 32%
>> Gerstley Borate - 21%
>> Calcium Carbonate (Whiting) - 20%
>> Nepheline Syenite - 16%
>> Edgar Plastic Kaolin (EPK) - 11%
>> Total: -100%
>>
>> Colors ------red/pink/purple/mauve
>> Add:
>> Tin Oxide - 5%
>> Chromium Oxide - 0.2%
>>
>> For a consistent solid purple with slight lavender hue -
>> Add:
>> Cobalt oxide - 1%
>>
>> Notes: color and hue in the purple range can be varied by varying the
>> amount of Cobalt Oxide - your choice. Test, test, test!
>>
>> Caution: Cobalt Oxide is slightly toxic until bound with glass formers..
>> Handle only with gloves and mask.
>>
>> Regards,
>>
>> John Rodgers
>> Chelsea, AL
>>
>>
>
> Hi John
> Glad to hear that your testing results were good.
>
> Just for order sake, the recipe,
> Floating Green
> 30 Neph Sye
> 21 G.B.
> 8 Whiting
> 10 Kaolin
> 31 Silica
> ADD
> 2 Chrome
> 1 Cobalt
>
>
> is not from MC6G but appears on John Hesselberth's website, Frogpond.
> It has been tested and is in the archives. I happen to use it in big
> batches and is always cosistent in cover and melt.
>
> Raspberry, the chrome and tin glaze that is in MC6G has appeared in Clay
> Times Jan/Feb. 05 issue,
> ever so slightly adjusted with an additon of .60 Cobalt Carb.
>
> The additves to the base were thus
> 0.2 Chrome
> 3.75 Tin
> 0.6 Co. Carb.
>
> and produced also similar results to your description of your tests.
>
> it was again written about on Clayart with the same base but now called
> Raspberry Blue
> with the
> addtion of
> 1 Cobalt Carb.
> 0.25 RIO which for me, yielded a covering and streaky medium Blue.
>
> one more time with the name
> Raspberry Purple
> with the addtion of
> 0.2 Chrome Ox.
> 7.5 Tin
> 1.0 Cobablt Carb
> 0.25 RIO
>
> so, more you can test!!
>
> Best regards,
> Alisa in Denmark
>
> ______________________________________________________________________________
> Clayart members may send postings to: clayart@lsv.ceramics.org
>
> You may look at the archives for the list, post messages, or change your
> subscription settings here: http://www.acers.org/cic/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at melpots2@visi.com
>
>
>
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