Glazes & Stains
- Spectrum® Raku Series Cone
06-04
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SUMMER SALE
20% Off - No
Minimum
Shop on-line as you
would normally and checkout. Our sales staff will deduct
the discount from the List Price and send
a notification by email with your adjusted total before charging
your account or credit card if the cart amount does not reflect the sale
price.
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Spectrum Raku Glazes / Cone
06-04
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WARNING! RAKU IS AN INHERENTLY DANGEROUS
PROCESS AND PROPER SAFETY PROCEDURES SHOULD ALWAYS BE FOLLOWED WHEN RAKU
FIRING! |
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Click here for Raku
Safety Equipment. For books about Raku, click here.
Raku glazes were developed for firing in gas kilns. The firing process
is described below. All but three of Spectrum Raku glazes are 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 too high in copper concentration to be
considered non-toxic in the liquid state. Spectrum 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. Spectrum dry glazes are set up for dipping application.
Please follow Spectrum's "Dry Glaze Mixing
Instructions” for mixing procedures and amount of water
required.
Spectrum® Raku Series glazes can be
thinned with water. For detailed suggestions regarding how to adjust the
set up of a dipping glaze please click
here for Spectrum's “Guide to Adjusting Glaze Viscosity and
Density”.
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Spectrum Raku glazes are
packaged in economical sizes to suit every need!
- 4 OZ. jars for testing new colors
Dry can be ordered in 5 LB.
increments to mix your own
PINTS for average studio use
GALLONS for large studios and schools
Compare prices between sizes and save on your
favorite colors!
Apply your Bailey Discount and save even more on
every Spectrum product you buy!!
Spectrum Glaze Discounts:
Please note that individual prices for glazes shown
below and on other pages are retail prices. After your order is placed
on-line, we will contact you with the total of your order with your Bailey
Discount applied. The more you buy, the more you save!
5% Discount on
Spectrum Products
totaling $1.00 - $9.99
10% Discount on
Spectrum Products
totaling $10.00 - $20.99
15% Discount on
Spectrum Products
totaling $21.00 - $35.99
20% Discount on
Spectrum Products
totaling $36.00 and
higher
Due to the many variables involved
in Raku firing, particularly during the reduction phase, our chip charts
should be used only as approximate guidelines. Your results may vary
greatly.
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RAKU
GLAZES
Raku glazes should be fired between Cone 011(1600° F)
to cone 06 (1850° F) in a gas kiln. Spectrum recommends firing
#850 ~ #859 to a peak of 1700° F ~ 1750° F and #860 ~ #867 to a
peak of 1600° F ~ 1650° F. Then 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 metal garbage can or small metal
container with a lid 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 in a well ventilated area.
Proper protective clothing and tools must be used for safety. |
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Try
to size the reduction bin to the size of the piece
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Position
the organic material (newspaper, sawdust, etc.) and the piece
so that the flames can get all around the piece.
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Different
organic materials can produce very different results, so 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.
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Pieces
should be cleaned immediately with water and a hard bristle
brush.
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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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