Judith Enright on wed 18 mar 98
I have a situation I don't understand and would appreciate anyone's help.
I mixed up a white slip and added about 2% crimson mason stain. The stain
remained through the bisque firing. When I coated the piece with a ^10 clear
matt glaze, the red burned out. (I've used this same clear matt glaze over blue
slip and it's beautiful.)
However, I've used the same crimson stain in a base glaze (albeit at 12%) and
it's fired beautifully with a rich deep red at ^10. Will someone illuminate me?
Appreciatively,
Judith Enright @ Black Leopard Clayware
email: BLeopard@ricochet.net
Stephen Mills on thu 19 mar 98
Was the base glaze clear or opaque?
Opaque material is difficult to colour, as it dampens down the effect
e.g. if you colour slip with 10% stain you only see the surface 2% (ish)
and that's been diluted!
At ^10 it would seem having been buried in slip and THEN covered in
glaze your 2% stain gave up and hid, I would!
Steve
Bath
UK
In message , Judith Enright writes
>----------------------------Original message----------------------------
>I have a situation I don't understand and would appreciate anyone's help.
>
>I mixed up a white slip and added about 2% crimson mason stain. The stain
>remained through the bisque firing. When I coated the piece with a ^10 clear
>matt glaze, the red burned out. (I've used this same clear matt glaze over blu
>slip and it's beautiful.)
>
>However, I've used the same crimson stain in a base glaze (albeit at 12%) and
>it's fired beautifully with a rich deep red at ^10. Will someone illuminate me
>
>Appreciatively,
>
>Judith Enright @ Black Leopard Clayware
>
>email: BLeopard@ricochet.net
>
--
Steve Mills
Bath
UK
home e-mail: stevemills@mudslinger.demon.co.uk
work e-mail: stevemills@bathpotters.demon.co.uk
own website: http://www.mudslinger.demon.co.uk
BPS website: http://www.bathpotters.demon.co.uk
David Hewitt on fri 20 mar 98
Judith,
I think that you have about answered your questionm when you say 'albeit
at 12%'.
I use stains and oxides in slips but not mason stains (That is not
becasue I have anything against them) and the colours include Coral and
Blythe Strong Red. They are both listed as siutable for 1300 deg. C.
The coral I use in a clear transparent glaze at 6% by weight and the
Blythe Strong Red I use in a white porcelain slip at 12%.
Presuming that your mason stains are rated as suitable for your
temperature, I would try adding more, say 12%, or experiment a bit.
if you wish to see the results i get, you might like to log onto My Web
Site as shown in my signature.
David
In message , Judith Enright writes
>----------------------------Original message----------------------------
>I have a situation I don't understand and would appreciate anyone's help.
>
>I mixed up a white slip and added about 2% crimson mason stain. The stain
>remained through the bisque firing. When I coated the piece with a ^10 clear
>matt glaze, the red burned out. (I've used this same clear matt glaze over blu
>slip and it's beautiful.)
>
>However, I've used the same crimson stain in a base glaze (albeit at 12%) and
>it's fired beautifully with a rich deep red at ^10. Will someone illuminate me
>
>Appreciatively,
>
>Judith Enright @ Black Leopard Clayware
>
>email: BLeopard@ricochet.net
>
--
David Hewitt
David Hewitt Pottery ,
7 Fairfield Road, Caerleon, Newport,
South Wales, NP6 1DQ, UK. Tel:- +44 (0) 1633 420647
Own Web site http://www.dhpot.demon.co.uk
IMC Web site http://digitalfire.com/education/people/hewitt.htm
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