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FIRE BY COLOR - NO PYROMETER NEEDED!
One Fire Sterling PMC in 45 minutes
PMC 3 and PMC+ in 30 minutes
Art Clay Silver in 15 minutes
Art Clay Copper in 20 minutes
(Times shown are approximate)
Can fire more than of 100 grams of clay
Firing surface is about 3" in diameter
Visually see your work while firing
Coleman tanks have about 100 min. of fuel
BBQ tank has
about 1500 min. of fuel
Test bar testing is recommended. We use 1/2” x 1.5” x 1mm thick samples.
Firing times will vary depending on
stove setting and air movement.
Cone & Burner
temperature when metals are very hot is challenging because photographs cannot
capture the light phenomenon accurately.
Experience is your best teacher and we suggest investing a small amount
of clay to master firing by eye. Make a
small strip of clay about the size of a paper match and allow it to dry. Light the burner and set the test strip on
the wire mesh screen. You will see a
wisp of smoke and a flame similar to the flame of a candle as the binder burns
away. This will last only a few seconds.
heats, the strip will shrink slightly and take on a pinkish color. This shifts to a yellow-orange color
that literally radiates outward. This is
not a color you could duplicate in paint or photograph because it has a glowing
quality. This is the color you want to
hold for 45 minutes (when firing One Fire Sterling PMC). Memorize this color and you will have
mastered firing by eye. This applies to
all silver clays fired with the SpeedFire™ & Burner.
to complete your education, turn up the heat slightly and watch what
happens. You will see the surface of the
test strip appear wet, a change described as “sweating.” You will then see the edges of the strip soften
and curl as the strip starts to melt.
Now that you know what this looks like, you will be able to turn the
heat down as soon as you see your artwork start to sweat. And aren’t you glad that you learned this on
a test strip instead of a treasure you worked on a long time!
Additional firing notes:
In addition to all grades of fine silver clay,
it has also proven to be an ideal firing method for the recently released Art
Clay Copper allowing a hands free firing time of just 20 minutes without the
cumbersome task of holding a torch on the copper clay piece for 5 or more
minutes and can fire larger pieces at one time than can be done with a
torch. Just pay close attention to
firing color to prevent over firing.