Glaze Stains

Can any colouring stain be used as a glaze stain or do you have to
specifically use a certain type.

Sam

Your question is a little open ended. There are stains that will not retain
the color they were meant to be if fired beyond the temperature range that
they are made for. When you buy the stain it will tell you the color and
the firing range.

Different oxides (colorants) will do different things in different
atmospheres (Reduction vs Oxidation) and in different chemical mixes.

Copper Oxide will be green in an oxidation and if lucky, red in reduction.
Chrome Oxide (bright green unfired) with Tin will create pink IF you use a
very small amount. Too much and you get a barfy color. Colbalt (Carbonate
is pink before being fired, Oxide is black) is almost always blue but can be
violet.

Can you clarify your question.

"Sam Kelly" wrote in message
...
Can any colouring stain be used as a glaze stain or do you have to
specifically use a certain type.

Sam

Temp. range is cone9, which in my kiln(Gas) is around 1225DegC. I will be
firing in oxidation as reduction will effect the colour. A client want's
bathroom basins done in grey and I don't have a grey glaze or the time to
make and test one so I thought a grey glaze stain mixed into a base glaze
might be the easy way out.

I see that there are stains for glazes, clay bodies, underglazes etc and was
wondering what if any difference there is.

I have only ever used oxides and 99% of tha in reduction, no experience with
glaze stains at all.

Sam


"DKat" wrote in message
...
Your question is a little open ended. There are stains that will not
retain the color they were meant to be if fired beyond the temperature
range that they are made for. When you buy the stain it will tell you
the color and the firing range.

Different oxides (colorants) will do different things in different
atmospheres (Reduction vs Oxidation) and in different chemical mixes.

Copper Oxide will be green in an oxidation and if lucky, red in reduction.
Chrome Oxide (bright green unfired) with Tin will create pink IF you use a
very small amount. Too much and you get a barfy color. Colbalt
(Carbonate is pink before being fired, Oxide is black) is almost always
blue but can be violet.

Can you clarify your question.

"Sam Kelly" wrote in message
...
Can any colouring stain be used as a glaze stain or do you have to
specifically use a certain type.

Sam

On Mon, 26 Mar 2007 11:59:07 +1000, "Sam Kelly"
wrote:

Temp. range is cone9, which in my kiln(Gas) is around 1225DegC. I will be
firing in oxidation as reduction will effect the colour. A client want's
bathroom basins done in grey and I don't have a grey glaze or the time to
make and test one so I thought a grey glaze stain mixed into a base glaze
might be the easy way out.

I see that there are stains for glazes, clay bodies, underglazes etc and was
wondering what if any difference there is.

I have only ever used oxides and 99% of tha in reduction, no experience with
glaze stains at all.

Sam

I can't answer your specific question, but I can tell you to
be especially careful in this case. Grey is a well-known
problem in that it has to be specifically formulated as grey.
It is not, as most people naturally assume, "light black",
which will tend to give odd color casts instead of remaining
neutral. My feeling is that testing is going to be unavoidable
here.

How about a clear glaze over a grey-firing body? Still
need to test the specific glaze and body combo, but
maybe you already have done that....?

Best regards,




Bob Masta

D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, Signal Generator
Science with your sound card!

In article ,
says...
On Mon, 26 Mar 2007 11:59:07 +1000, "Sam Kelly"
wrote:

Temp. range is cone9, which in my kiln(Gas) is around 1225DegC. I will be
firing in oxidation as reduction will effect the colour. A client want's
bathroom basins done in grey and I don't have a grey glaze or the time to
make and test one so I thought a grey glaze stain mixed into a base glaze
might be the easy way out.



the problem really, stems from the fact that glaze isnt paint. its
silica and chemistry. you want grey, but if you use iron oxide in
reduction you will get brown black, but adding zinc oxide to whiten it
will cause it to fire red (and crawl) . there are a thousand or more
combinations to even a basic colour, and all of them have thier problems
and limitations. soloution? test, test test. keep good glaze log
books, fire consistantly and pray to the gods of fire.....

or, but glaze the right formulated colour from one of the wholesalers,
like mayco, duncan or spectrum, if you dont like the colours they have,
you can always fiddle with the balance. but getting a specific colour
is nigh impossible. the same batch of my celedon comes out various
shades to green, depending on the humidy and outside temprature. even
10 degrees variance at 2500c can cause the colour to develiop
diffrently. not enough air, too much air, the bad phase of the moon...

its what drives us all to drink, and to do that, we need pots to drink
out of.....