iandol on wed 22 may 02
Dear Marni Turkel=20
Perhaps you may need to look at this question from a different =
perspective and think in terms of mixing opaque colours.
We tend to derive Orange from iron in oxidation and Blue from Cobalt. =
These Hues are complementary on the colour wheel and tend do neutralise =
each other, removing Hue but just leaving Tonal Value and Intensity =
constant. To get a good grey or black you need to get a good balance =
between the two contributing hues. I suggest a little more Cobalt in =
your 8/5 mixture to remove the remaining orange which will be giving you =
a dark, dingy, dirty brown. Adding Chrome oxide helps when the Iron =
tends towards promoting a Red nuance to the mixture, providing green as =
a complement of red.
A good experiment to try out is to get some Cobalt Blue and Burnt Sienna =
watercolour paints and do some line blends on white paper. It is a =
quick way to learn how some of these things work without the time and =
expense of firing trials
The hue coming from Manganese compounds under your firing conditions =
will tend to be Yellow rather than orange-red. Furthermore, considerable =
quantities are needed to get strong colour intensities. So this adds =
nothing to neutralise the dominant hues contributed by Iron and Cobalt.
Hope this throws some light on things for you.
Best regards,
Ivor Lewis.
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