Saha on sat 7 may 05
I came upon a test tile of amber celadon over a 'Blue Glaze' at Centre=20
College in Danville, Kentucky and was wondering if the generic 'Blue Slip'=
=20
is comparable or in fact identical to Albany, Albany Synthetic, or Alberta=
=20
Slip, or is 'Blue Slip' a seperate slip altogether?=20
... I am a new potter, just starting out, and looking for some help for my=
=20
'Approaches to Firing' class in the Fall. .. I would appreciate any guidanc=
e=20
possible.
Thank you!
Snail Scott on sun 8 may 05
At 02:45 PM 5/7/2005 -0400, you wrote:
>...was wondering if the generic 'Blue Slip'
>is comparable or in fact identical to Albany, Albany Synthetic, or Alberta
>Slip, or is 'Blue Slip' a seperate slip altogether?
Albany slip and its substitutes are quite dark
brown, so I wouldn't think they'd be used as the
base for anything called 'blue'. If it's actually
bluish in color (under the glaze), it's more
likely a slip from a recipe, (not a 'natural'
slip,) and based on some common whitish clay. A
blue slip can be made by merely adding cobalt to
a white clay body, but adding some non-plastic
materials (calcined clay, for instance) will make
it easier to apply without cracking over clay
that's no longer wet itself. The more non-plastics
you add, the drier the underlying clay can be when
you apply it. With at least 50% non-plastics, you
can even apply it to bisqueware. If you are
planning to glaze over it, though, I'd apply it
on greenware and bisque it together before
glazing.
-Snail
Earl Brunner on sun 8 may 05
When Albany was available, we used to add cobalt to it for an oxide
decoration. Adding the cobalt to the Albany muted the cobalt and softened
it so that it wasn't so "blue"..........
Earl Brunner
Las Vegas, NV
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Snail Scott
Sent: Sunday, May 08, 2005 6:45 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: post- thread 'albany slip'
At 02:45 PM 5/7/2005 -0400, you wrote:
>...was wondering if the generic 'Blue Slip'
>is comparable or in fact identical to Albany, Albany Synthetic, or Alberta
>Slip, or is 'Blue Slip' a seperate slip altogether?
Albany slip and its substitutes are quite dark
brown, so I wouldn't think they'd be used as the
base for anything called 'blue'. If it's actually
bluish in color (under the glaze), it's more
likely a slip from a recipe, (not a 'natural'
slip,) and based on some common whitish clay. A
blue slip can be made by merely adding cobalt to
a white clay body, but adding some non-plastic
materials (calcined clay, for instance) will make
it easier to apply without cracking over clay
that's no longer wet itself. The more non-plastics
you add, the drier the underlying clay can be when
you apply it. With at least 50% non-plastics, you
can even apply it to bisqueware. If you are
planning to glaze over it, though, I'd apply it
on greenware and bisque it together before
glazing.
-Snail
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