niki crosby on thu 22 mar 07
So I'm reading Mastering Cone6 glazes - preparing for my new life of mixing
glazes myself - I just finished chapter 3. And I'm wondering: how do stores
like crate and barrel and pottery barn etc. make their glazes? I see so many
reds and firey oranges in their catalogs, doesnt that require use of cadmium
and other glazes that leach in unfriendly amounts?
(I take this assumption not from the book so much as personal experience as
I love red glaze and when I have approached my studio managers in the past
about mixing up some red or hot pink glaze recipe I found in ceramics
monthly they would all reply that many of the ingredients were a "no-no" -
even for recipes for cone 10)
Maybe my question will be adressed in chapter 4, I dont know, but I lay
awake in the dark last night trying to figure it out.
Niki Crosby
John Hesselberth on thu 22 mar 07
On Mar 22, 2007, at 9:54 AM, niki crosby wrote:
> I see so many
> reds and firey oranges in their catalogs, doesnt that require use
> of cadmium
> and other glazes that leach in unfriendly amounts?
Hi Niki,
While one can get nice bright reds using copper in reduction firing,
I suspect most department store reds are made with so-called cadmium
inclusion stains. If they have properly formulated glazes and have a
good testing program that can be done so leaching is minimal and
within legal standards. Do they? Your guess is as good as mine. Of
course there are also chrome-tin reds--you will see a good example of
that in Chapter 6--but they are a red more like raspberries or
cranberries.
I'm delighted to know you are reading the early chapters instead of
just jumping to the recipes and mixing away. It will serve you well
when you do get to the mixing, applying, and firing.
Regards,
John
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