Dan Dermer on mon 14 mar 05
I haven't really tested in the direction of copper pinks, but the Coleman
Purple base might get you there. I did some colorant testing about a year
ago that resulted in pinks using 3% copper carb and 1-1.5% tin oxide in that
base glaze.
Maybe that's due to having the copper to tin ratio go up as high as 3 to 1.
When it's the other way around, and you have .5% copper to 1.5% tin oxide,
you'll get red instead. Just some possible directions for you to
investigate in differing ratios of copper to tin. If you run some tests --
let us know your results!
-Dan
p.s. pix of Coleman Purple (which is kind of a pinky-purple) on my home
page:
http://pages.sbcglobal.net/ddermer
recipe on the recipes page
mim on mon 14 mar 05
I'm a first year student doing an assignment about copper reds- my particular slant is pinks.
I have come to understand that these are usually viewed as a flaw. I have some useful information
to go on (from a robert tichane book explaining how to avoid it) on how a recipe/firing might be
modified to achieve a pinker copper red- but was wondering if anyone could offer me any
practicle, from experience type advice- as this (experience) is what i'm still lacking...
thanx, mim:)
David Hendley on mon 14 mar 05
In my experience, excess silica in the glaze formula leads to copper pinks
rather than reds.
Underfiring will also cause this, which makes sense because, in a way,
underfiring is similar to having too much silica for the fluxes to melt
completely.
David Hendley
I don't know nothin' but the blues, cobalt that is.
david@farmpots.com
http://www.farmpots.com
----- Original Message -----
>
> I'm a first year student doing an assignment about copper reds- my
> particular slant is pinks.
> I have come to understand that these are usually viewed as a flaw. I have
> some useful information
> to go on (from a robert tichane book explaining how to avoid it) on how a
> recipe/firing might be
> modified to achieve a pinker copper red- but was wondering if anyone could
> offer me any
> practicle, from experience type advice- as this (experience) is what i'm
> still lacking...
>
>
kevinfinegan2003 on wed 16 mar 05
Here's a glaze recipe I got from the Anderson Ranch Glaze Book many
years ago. Although it's titled Dark Red, it'always come out pink for
me no matter how I fire it.
Keator Dark Red
Ball Clay 90
Whiting 185
Silica 270
Custer 360
Kona F-4 50
Kaolin 25
Dolomite 20
Bentonite 3
Copper Carb 3
Kevin in San Antonio
Maggie Woodhead on wed 16 mar 05
Hi Mim, Kia Ora,
I have been working with copper reds ever=
since=20
the Denver NCECA when I came in touch with potters using Pete Pinnell=
s glaze=20
recipe. I am firing in a gas kiln made by my husband and also measur=
e the=20
temperature with a digital millivoltmeter which measures across the p=
robe=20
rather than the conventional pyrometer. I also strike fire at about=
920=BAC=20
dropping the temperature very slowly (have taken as long as one and h=
alf=20
hours for this part of the firing) down to just over 790=BA C. The p=
aler=20
colours are achieved at around 900=BAC and the red colour deepens tow=
ards the=20
lower temperature. Still experimenting when I get enough pots made.
I also believe that the reduction should be light to medium (how do y=
ou=20
measure that?) and pots need protection from too much flame. Good Lu=
ck to=20
us both. I'm looking forward to my next firing.
Regards and Best wishes Maggie, from New Zealand
maggie.w@paradise.net.nz
----- Original Message -----=20
=46rom: "mim"
To:
Sent: Tuesday, March 15, 2005 7:29 AM
Subject: copper red to pink
I'm a first year student doing an assignment about copper reds- my=
=20
particular slant is pinks.
I have come to understand that these are usually viewed as a flaw. I =
have=20
some useful information
to go on (from a robert tichane book explaining how to avoid it) on h=
ow a=20
recipe/firing might be
modified to achieve a pinker copper red- but was wondering if anyone =
could=20
offer me any
practicle, from experience type advice- as this (experience) is what =
i'm=20
still lacking...
thanx, mim:)
_____________________________________________________________________=
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