Karl P. Platt on sat 24 may 97
>Looking at a cone/temp/color chart I was wondering a little about the
>technical side of the colors emitted by the heat from a kiln at various
>temperatures... Does anyone know if these colors starting at red,
orange,
>yellow, white heat and moving up the scale to "dazzling white" at cone
16
>(I believe?)... What colors, if any, would follow dazzling white?
The color seen in a hot kiln is proportional to temperature in accord
with the Stefan-Boltzmann law. Look this up in a physics book. "White"
heat, I mean really white heat becomes apparent at 5000 K or so -- way
above cone 16. My experience with 1,800 C (+/- 3 000 F) is that while
it's intensely "whitish" it's really rather more yellow.
Photographer's tungsten filament lamps are rated in according to their
"color-temperature", but their spectrum is anything but inherently
linear -- this is why there are films for "daylight and tungsten light
-- the tungsten light is more yellow. The correlation between color and
temperature is widely used for pyrometry.
Follow this link for the gory details on Heat Transfer:
http://widget.ecn.purdue.edu/~meheattr/links.html
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