David Hendley on fri 8 oct 99
Thanks for the comments about the copper red
article in Ceramics Monthly.
The genesis for the article was about 2 years ago right
here on Clayart!
Ron Roy was postulating that zinc oxide was volatilized
out of reduction glazes at a low temperature, and thus
served no purpose.
I was interested in getting rid of the barium carbonate
in my glazes.
Together, we set up the parameters for testing both
materials, and I set about firing.
Lee, I hope you are still happy AFTER you open that kiln.
You know those copper reds.....
Here is information about the yellow stain, copied from
a previous Clayart posting. It's called "inclusion" or
"encapsulated" stain because the cadmium is chemically
bound with inert ingredients.
I have been using these encapsulated cadmium stains for years.
There are 4 colors: intensive red, Bordeaux red, orange, and yellow.
I use them at cone 10+ in a wood-fired kiln, and the color still holds
up. This is pretty remarkable; the only tougher test I can think of
would be to try them at cone 10 in a wood-fired salt or soda kiln.
Generally speaking, the colors stay bright primary colors in a
low-fire oxidation situation. Higher temperatures and reduction,
as you would expect, mute the bright colors to more earthy tones,
but they are still, without a doubt, red, orange, and yellow that
are unattainable via any other route at cone 10 reduction.
In this atmosphere, it takes quite a bit of stain for good saturated
color, about 8 - 10% in a glaze, and 12 -15% in a slip.
This gets expensive in a hurry, with the stains selling for about
$40 to $60 a pound. I don't know, but I think you would be able to
get by with less as you fire in oxidation at lower temperatures.
The manufacturer claims that these stains are food-safe, but I
treat them as the dangerous cadmium that they are. That means being
extra careful with the raw stains, and using them only on non-food-
bearing pottery surfaces.
In fact, except for some tests, I only use the stains in slip-glazes
that I brush on the exterior of pots. This serves the dual purpose
keeping them away from food contact points, and making a little
stain go a long way. One pound of stain will glaze or decorate
hundreds of pots used this way.
I've also found it unnecessary to keep the orange stain on hand; if
I want orange, I can just mix red and yellow. The two reds are
a little different and I would suggest you try both, to see which you
prefer, and then buy only that one.
Trinity Ceramic Supply is the distributor for Cerdec stains and is across
the parking lot from their offices (and a million dollar stain inventory!)
I don't think any other suppliers can match Trinity's price, about
$40 a pound the last time I bought some.
Trinity offers two stain sampler packages: the four cadmium encapsulated
stains, and a package of 8 or 10 regular stains.
--
David Hendley
Maydelle, Texas
hendley@tyler.net
http://www.farmpots.com/
----- Original Message -----
From: Lorraine Pierce
To:
Sent: Thursday, October 07, 1999 7:20 PM
Subject: Re: copper reds
| ----------------------------Original message----------------------------
| David, that was a very impressive bit of research in Ceramics Monthly on
copper
| reds! Wish I had had it when I had my gas kiln and was doing them...but I
think
| the barium and zinc findings would be applicable in other glazes also.
| Question...under the picture of your two mugs (loved 'em) the notation
| stated..."yellow inclusion stain". I am not familiar with the term
'inclusion
| stain', tho I realize any water stain with colorants would be
inclusive...is
| that it?Or does it refer to a fritted stain? Again, thanks for a
fascinating
| article. Lori in New Port Richey Fl.
|
| Lee Marshall wrote:
|
| > ----------------------------Original message----------------------------
| > David
| > thanks for a great article in ceramics monthly. i have just mixed up a
new
| > batch of my copper red glaze and reformulated it to remove the barium
and
| > zinc. can't wait to open the kiln. i've wanted to get rid of the barium
for
| > years but fear of testing kept it in there. it just seemed like i was
always
| > too rushed to do the testing. thanksTHANKS!!!thanks
| > lee
| > LMarsh1220@aol.com
|
Lee Marshall on fri 8 oct 99
David
i just opened my kiln this morning and the reds are Georgous! thanks again. i
bought an oxyprobe about 6 month's ago and have been getting consistent reds
ever since.
lee
lmarsh1220@aol.com
gelindo ferrin on sat 9 oct 99
Thanks for the info on the cerdac stains.Do you mhave
a number or E address for trinity ceramic
supply?thanks!
--- David Hendley wrote:
> ----------------------------Original
> message----------------------------
> Thanks for the comments about the copper red
> article in Ceramics Monthly.
> The genesis for the article was about 2 years ago
> right
> here on Clayart!
> Ron Roy was postulating that zinc oxide was
> volatilized
> out of reduction glazes at a low temperature, and
> thus
> served no purpose.
> I was interested in getting rid of the barium
> carbonate
> in my glazes.
> Together, we set up the parameters for testing both
> materials, and I set about firing.
>
> Lee, I hope you are still happy AFTER you open that
> kiln.
> You know those copper reds.....
> Here is information about the yellow stain, copied
> from
> a previous Clayart posting. It's called "inclusion"
> or
> "encapsulated" stain because the cadmium is
> chemically
> bound with inert ingredients.
>
>
> I have been using these encapsulated cadmium stains
> for years.
> There are 4 colors: intensive red, Bordeaux red,
> orange, and yellow.
> I use them at cone 10+ in a wood-fired kiln, and the
> color still holds
> up. This is pretty remarkable; the only tougher test
> I can think of
> would be to try them at cone 10 in a wood-fired salt
> or soda kiln.
>
> Generally speaking, the colors stay bright primary
> colors in a
> low-fire oxidation situation. Higher temperatures
> and reduction,
> as you would expect, mute the bright colors to more
> earthy tones,
> but they are still, without a doubt, red, orange,
> and yellow that
> are unattainable via any other route at cone 10
> reduction.
> In this atmosphere, it takes quite a bit of stain
> for good saturated
> color, about 8 - 10% in a glaze, and 12 -15% in a
> slip.
> This gets expensive in a hurry, with the stains
> selling for about
> $40 to $60 a pound. I don't know, but I think you
> would be able to
> get by with less as you fire in oxidation at lower
> temperatures.
>
> The manufacturer claims that these stains are
> food-safe, but I
> treat them as the dangerous cadmium that they are.
> That means being
> extra careful with the raw stains, and using them
> only on non-food-
> bearing pottery surfaces.
> In fact, except for some tests, I only use the
> stains in slip-glazes
> that I brush on the exterior of pots. This serves
> the dual purpose
> keeping them away from food contact points, and
> making a little
> stain go a long way. One pound of stain will glaze
> or decorate
> hundreds of pots used this way.
> I've also found it unnecessary to keep the orange
> stain on hand; if
> I want orange, I can just mix red and yellow. The
> two reds are
> a little different and I would suggest you try both,
> to see which you
> prefer, and then buy only that one.
>
> Trinity Ceramic Supply is the distributor for Cerdec
> stains and is across
> the parking lot from their offices (and a million
> dollar stain inventory!)
> I don't think any other suppliers can match
> Trinity's price, about
> $40 a pound the last time I bought some.
> Trinity offers two stain sampler packages: the four
> cadmium encapsulated
> stains, and a package of 8 or 10 regular stains.
>
> --
> David Hendley
> Maydelle, Texas
> hendley@tyler.net
> http://www.farmpots.com/
>
>
>
>
>
>
> ----- Original Message -----
> From: Lorraine Pierce
> To:
> Sent: Thursday, October 07, 1999 7:20 PM
> Subject: Re: copper reds
>
>
> | ----------------------------Original
> message----------------------------
> | David, that was a very impressive bit of research
> in Ceramics Monthly on
> copper
> | reds! Wish I had had it when I had my gas kiln and
> was doing them...but I
> think
> | the barium and zinc findings would be applicable
> in other glazes also.
> | Question...under the picture of your two mugs
> (loved 'em) the notation
> | stated..."yellow inclusion stain". I am not
> familiar with the term
> 'inclusion
> | stain', tho I realize any water stain with
> colorants would be
> inclusive...is
> | that it?Or does it refer to a fritted stain?
> Again, thanks for a
> fascinating
> | article. Lori in New Port Richey Fl.
> |
> | Lee Marshall wrote:
> |
> | > ----------------------------Original
> message----------------------------
> | > David
> | > thanks for a great article in ceramics monthly.
> i have just mixed up a
> new
> | > batch of my copper red glaze and reformulated it
> to remove the barium
> and
> | > zinc. can't wait to open the kiln. i've wanted
> to get rid of the barium
> for
> | > years but fear of testing kept it in there. it
> just seemed like i was
> always
> | > too rushed to do the testing.
> thanksTHANKS!!!thanks
> | > lee
> | > LMarsh1220@aol.com
> |
>
=====
__________________________________________________
Do You Yahoo!?
Bid and sell for free at http://auctions.yahoo.com
Jim Brooks on mon 11 oct 99
I just checked their catalog..and found no Email address.. I dont know if
the have one or not..but i will try to call them this week and double check.!
Just for information.. they are at 9016 Diplomacy Row, Dallas, Tx 75247,
phone (214) 631-0540..fax (214)736-6463........
| |
|
