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englobes/slips/slip-glazes/buffer layers

updated sun 11 feb 01

 

vince pitelka on fri 9 feb 01


> All of the above are defined and discussed to a limited extent in Frank
> and Janet Hamers' The Potter's Dictionary of Materials and Techniques.

Joyce -
I appreciate your explanation from Hammer, but as much as I respect that
almost-all-inclusive tome, this does not mean at all that their definition
is the correct one. There is much misunderstanding concerning ceramic
terminology, expecially between continents. I doubt that we can entirely
come to an agreement with our dear friends overseas, but it is important
that we reach some sort of standardization of ceramic terms. I still say
that the most reasonable definition is that an engobe is a slip with
non-plastic additives to allow application to bone-dry or bisque-fired
wares. This fits the Hammer definition, but narrows it a bit, which is
needed.
Best wishes -
- Vince

Vince Pitelka
Appalachian Center for Crafts
Tennessee Technological University
1560 Craft Center Drive, Smithville TN 37166
Home - vpitelka@dtccom.net
615/597-5376
Work - wpitelka@tntech.edu
615/597-6801 ext. 111, fax 615/597-6803
http://www.craftcenter.tntech.edu/

Joyce Lee on fri 9 feb 01


All of the above are defined and discussed to a limited extent in Frank
and Janet Hamers' The Potter's Dictionary of Materials and Techniques.
One distinction they offer between clay slips and engobes is that the
clay slip is essentially a fluid form; an engobe can be in a jelly form
or a stiff form. The Hamers state that an engobe is often halfway
between a clay and a glaze in composition and contains materials which
are normally considered glaze materials, which means it fires to a more
vitreous state than the body which it covers. However, since the engobe
does not fuse to a glassy state, it cannot be called a glaze. And since
it can be composed entirely of non-clay materials, it cannot be called a
slip. According to the Hamers, the term engobe is often the only one
that is suitable. (Most of this is directly from their dictionary.)

Joyce
In the Mojave where we had snow when I walked the desert yesterday. As
is often the case with our rain, couldn't be sure it was snow without a
close examination, but it was... and we were all overjoyed... flying and
darting about ... not even caring that a person was amongst us.