View Full Version : cool/warm blue

John H
09-20-2000, 02:31 AM
It seems like most of the art books I've read over the years calls blue-toward-green "cool blue" and blue-toward-purple "warm blue"; but some have it the other way around. I have to admit that an ultramarine sky looks colder to me than a cerulean sky - but I've mostly been taught the other way around. Is there a standard concensus on this? Which one do you consider "cool" and "warm"?

09-20-2000, 09:12 PM
Well John....I use Pthalo blue as my warm blue version...and Ultramarine Blue as my cool.

I guess my senses pick up on the yellow leaning of the green mix which makes up the Pthalo blue, and the violet sense of Ultramarine which pits it as opposite "yellow" - the component again of pthalo blue. (Opposite that is in the traditional consideration of the three primary color wheel).


09-20-2000, 09:17 PM
Ah Sandi,

but if you add Phtalo blue to the red you have a warmer cooler red, than the cooler cooler red you'd get with Ultramarine Blue.

Then...if your red is a cool red, but add a warm blue. Or a cool red with a cool blue, or warmer red ...oh, good grief! http://www.wetcanvas.com/ubb/eek.gif


John H
09-30-2000, 11:38 AM
Thanks for your responses; I finally landed - but this doesn't look like Kansas. http://www.wetcanvas.com/ubb/smile.gif
Chromacryl names their primaries Cool Blue, Warm Blue, etc. Cool Blue is thalo and Warm Blue looks like ultramarine. Their ad in the '97 Dick Blick catalogue says, "...mix Cool Red with Warm Blue for violet; mix Cool Blue and Cool Yellow to get a bright green; Warm Red with Warm Yellow for brilliant oranges". This is their "color mixing system". Maybe thalo=cool is in a color mixing context and thalo=warm is in a landscape context where the sun (yellow) is considered the warmest color; and thalo is closer to yellow than ultramarine??? Just a guess.