Dee Simpson on mon 22 apr 02
Howdeeee,
When substituting Ball Clay for Kaolin, what needs to be changed in the
recipe. (Cone 10 reduction). If anyone has any ideas, websites or books
that can help I would be very greatful!!!!!!
TIA
Dee
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Paul Lewing on tue 23 apr 02
on 4/22/02 1:08 PM, Dee Simpson at deepebble1@NETSCAPE.NET wrote:
> When substituting Ball Clay for Kaolin, what needs to be changed in the
> recipe. (Cone 10 reduction).
Ball clay generally has more silicon dioxide than kaolin, so you might have
to cut down the amount of added silica in the kaolin-containing recipe. To
do an exact duplication, you need to do it at the molecular level. However,
if there's not a lot of clay in the recipe, say 5% or so, you might not
notice any difference in surface quality in a straight-across substitution.
Where you might notice more difference is in the color. Ball clay has about
twice as much iron as kaolin, so clear and white glazes may be a bit darker
or muddier. In colored glazes, you probably wouldn't notice much
difference.
Paul Lewing, Seattle
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