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Series: 850 to 867
Glaze Type: Low Temperature
Our Raku glazes were developed for firing in either electric or gas
kilns. The firing process is described below. Three of our Raku glazes
are not lead-free (857,858, and 867 contain lead and cadmium). Four of
the Raku glazes are lead-free and non-toxic (850,851,854, and 856). All
of the rest are lead-free, but are over the threshold limit for copper
and are therefore not non-toxic in the liquid state. Our liquid glazes
(available in 4 ounce, pints and gallons) are set up for brushing
application. They can also be poured or dipped on pieces, although they
should probably be thinned with a little water for this type of
application. Our dry glazes (available in 10 pound bags) are set up for
dipping application. Please follow our "Dry Glaze Mixing Instructions"
for mixing procedures and for the amount of water required. 862 to 867
are not available dry.
Due to the many variables involved in Raku firing, particularly during
the reduction phase, our chip charts and printed color charts should be
used only as approximate guidelines. Your results may vary greatly.
RAKU FIRING - Raku glazes can be fired anywhere from 1600 F up to cone
06 (1850 F) in either an electric or gas kiln. We recommend firing 850
to 859 to a peak of 1700 - 1750 F and 860 to 867 to a peak of 1600 -
1650 F. They should be allowed to cool in the kiln to 1600 F. Different
combinations of peak temp and reduction starting temp will produce
different results. While still red hot they should be transferred as
quickly as possible into a reduction bin (typically a lidded metal
garbage can or small metal container that has been lined with organic
material, such as newspaper and/or sawdust, etc.). As soon as the
pieces are in the bin the lid should be put on to keep oxygen from
entering the container, in order to develop the reduction atmosphere.
The pieces should be allowed to cool in the bin for at least 20
minutes. When the red hot pieces go into the bin the organic material
ignites producing flames and smoke so this part of the firing,
particularly the opening of the reduction bin, should be done outside.
FIRING TIPS: * Try to size the reduction bin to the size of the piece *
Establish a good seal to the reduction bin so that air is not entering
and smoke is not leaving the bin. *Position the organic material (
newspaper, sawdust, etc.) and the piece so that the flames can get all
around the piece. *Different organic materials may produce very
different results, for example a glaze reduced in newspaper could be a
beautiful blue color and the same glaze reduced in sawdust could have a
metallic copper appearance. *Pieces should be cleaned immediately with
water and a hard bristle brush. *After cleaning, warm the pieces in the
kiln to evaporate any water from the piece. This helps to set the
colors more permanently.
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