Beach, Sue on mon 29 nov 04
Several weeks ago I posted a question about using a little bit of Albany =
Slip I inherited. That got me thinking about what slips might be =
interesting using the various clays I have on hand, so I experimented =
and am posting the results below. Nothing fancy here; pretty basic =
stuff, but maybe it will help someone.
=20
I fire to ^6 electric. Each slip was mixed to a consistency for =
brushing onto leatherhard clay and tested on small bowls. Slip was =
brushed inside & outside the bowls. After bisque firing, clear glaze =
was poured inside ONLY in each bowl thereby giving me the raw slip on =
the outside & a glazed surface on the inside. Except where noted, the =
mixture was just the clay/slip & water.
=20
Albany Slip - nice dark brown glaze on outside of bowl, as expected. =
Under clear glaze, the brown is muted & mottled.
=20
Bay City Slip - this was another inherited item & I don't believe it is =
commercially available. My mentor dug this up himself, I believe. It =
made a brown glaze on the outside similar to Albany but not as dark. On =
inside under the clear glaze, it turned a grayish green.
=20
Red Art - outside was reddish brown, rough, raw clay, nothing glaze-like =
at all. Inside under clear it makes a dark brown similar to the dark =
brown of Albany slip.
=20
Wake Forest - this is some native clay I dug in Wake Forest, NC several =
years ago. It has sparkly specks of something in it (mica?). On =
outside it did not form a glaze & was a reddish brick color with a raw =
clay feel. Inside under clear it yielded a medium brown very similar to =
the red art under clear glaze.
=20
Blackbird - did not form a glaze and was raw clay feeling on outside, =
very dark almost black. Under clear glaze it was a nice dark brown, =
darker than the Albany slip.
=20
Peterson slip (recipe from Susan Peterson's book, "The Craft & Art of =
Clay") w/5% ochre added - gave a slightly yellowy white; raw & matte =
feeling on outside; did well under clear glaze; I was trying for more =
yellow; will test again with more ochre
=20
Columbus Clay Albany Slip Substitute - made a glossy chocolate brown on =
the outside. On inside of bowl, it looks as if the slip all ran to the =
bottom of the bowl under the clear glaze and puddled there
=20
Ravenscrag Slip - This did not have any noticeable color at all. It was =
milky to clear both outside & inside.
=20
Alberta Slip - this was brown on the outside and it ran into a brown =
puddle under the clear glaze
=20
David Hendley's Albany Substititue - chocolate brown on outside; more =
Albany-like on inside under clear glaze
=20
Banjo - this is clay I dug locally (from a river bank) that is gray =
when raw. This was brown & rough with lots of unmelted material. The =
clear glaze just coated the roughness.
=20
Hoyt Acres - this is clay I dug locally that is brown when raw. Brick =
red/brown & dry where raw; pooled into a milky gray-brown under the =
clear.
=20
By the way, I haven't forgotten my promise to several of you who =
answered my questions to post results of my experiments with ash. I =
just have not had a chance to do the tests yet. I thought I had more =
time available than I actually did, as usual. =20
=20
Sue Beach
Muncie, IN USA
Potters Council Member
=20
Tom Sawyer on mon 29 nov 04
Just posted a question about Bringle's Slip. Have a student that I told
about it and dug up some sample tests I did about a year ago and always
wanted to pursue - so up pops this high-school student who asked if he could
work in my studio after school and on weekends. I did about a dozen tests
using [I believe about 20%] mason stains. I then used a clear ^6 glaze on
top and got a nice yellow, red, green and purple to mention a few. What is
appealing about the Bringle's is that is said it can be used on wet, dry and
even bisque ware.
Tom Sawyer
tsawyer@cfl.rr.com
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Beach, Sue
Sent: Monday, November 29, 2004 2:48 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: RESULTS: slips
Several weeks ago I posted a question about using a little bit of Albany
Slip I inherited. That got me thinking about what slips might be
interesting using the various clays I have on hand, so I experimented and am
posting the results below. Nothing fancy here; pretty basic stuff, but
maybe it will help someone.
I fire to ^6 electric. Each slip was mixed to a consistency for brushing
onto leatherhard clay and tested on small bowls. Slip was brushed inside &
outside the bowls. After bisque firing, clear glaze was poured inside ONLY
in each bowl thereby giving me the raw slip on the outside & a glazed
surface on the inside. Except where noted, the mixture was just the
clay/slip & water.
Albany Slip - nice dark brown glaze on outside of bowl, as expected. Under
clear glaze, the brown is muted & mottled.
Bay City Slip - this was another inherited item & I don't believe it is
commercially available. My mentor dug this up himself, I believe. It made
a brown glaze on the outside similar to Albany but not as dark. On inside
under the clear glaze, it turned a grayish green.
Red Art - outside was reddish brown, rough, raw clay, nothing glaze-like at
all. Inside under clear it makes a dark brown similar to the dark brown of
Albany slip.
Wake Forest - this is some native clay I dug in Wake Forest, NC several
years ago. It has sparkly specks of something in it (mica?). On outside it
did not form a glaze & was a reddish brick color with a raw clay feel.
Inside under clear it yielded a medium brown very similar to the red art
under clear glaze.
Blackbird - did not form a glaze and was raw clay feeling on outside, very
dark almost black. Under clear glaze it was a nice dark brown, darker than
the Albany slip.
Peterson slip (recipe from Susan Peterson's book, "The Craft & Art of Clay")
w/5% ochre added - gave a slightly yellowy white; raw & matte feeling on
outside; did well under clear glaze; I was trying for more yellow; will test
again with more ochre
Columbus Clay Albany Slip Substitute - made a glossy chocolate brown on the
outside. On inside of bowl, it looks as if the slip all ran to the bottom
of the bowl under the clear glaze and puddled there
Ravenscrag Slip - This did not have any noticeable color at all. It was
milky to clear both outside & inside.
Alberta Slip - this was brown on the outside and it ran into a brown puddle
under the clear glaze
David Hendley's Albany Substititue - chocolate brown on outside; more
Albany-like on inside under clear glaze
Banjo - this is clay I dug locally (from a river bank) that is gray when
raw. This was brown & rough with lots of unmelted material. The clear
glaze just coated the roughness.
Hoyt Acres - this is clay I dug locally that is brown when raw. Brick
red/brown & dry where raw; pooled into a milky gray-brown under the clear.
By the way, I haven't forgotten my promise to several of you who answered my
questions to post results of my experiments with ash. I just have not had a
chance to do the tests yet. I thought I had more time available than I
actually did, as usual.
Sue Beach
Muncie, IN USA
Potters Council Member
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