Spectrum Raku Glaze 880 Armadillo Pint: (replaces Gator Skin)
Spectrum 850 series Raku GlazesSeries: 850 to 879 Glaze Type: Low Temperature
Raku glazes are some of the most popular choices due to the beautiful and unique appearance that each piece offers. Spectrum 850 Series Raku Glazes can be applied by brush, poured, or used for dipping. These glazes can be fired up to cone 06.
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 due to different firing conditions.
850-879 - Our Raku glazes were developed for firing in either electric
or gas kilns. The firing process is described below. Eleven of the Raku
glazes are lead-free and non-toxic
(850,851,854,856,871,872,873,874,875,877,878). 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 866 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 due
to different firing conditions.
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 856 and 868 to 879 to a peak of 1700 - 1750 F and 860 to 866 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
WARNING: When red hot pieces go into the bin, the organic material
ignites and will produce flames and smoke. This part of the firing,
particularly the opening of the reduction bin, should be done outside.
Always take safety precautions when firing raku such as the use of high
temperature gloves, protective eyewear, and a respirator. Always have a
fire extinguisher handy.
- 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
- Pieces should be cleaned immediately with water and a hard bristle
After cleaning, warm the pieces in the kiln to evaporate any water from
the piece. This helps to set the colors more permanently.