Does anyone know what the term "cardinal" might apply to as far as a method in art work?  The phrase I'm looking at pertains to architecture, and the piece is described as being done in "Cardinal, Grisaille, varnish and colored pencil."  The other three are obvious, but cardinal?


Bruce Bartrug
Nobleboro, Maine, USA
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•The world is a dangerous place, not because of those who do evil, but because of those who look on and do nothing.  - Albert Einstein
•In the end, we will remember not the words of our enemies, but the silence of our friends. -Martin Luther King


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