you are describing the difference between pigments and light.
----- Original Message -----
From: <hal@finney.org>
To: <extropians@extropy.org>
Sent: Monday, January 22, 2001 11:34 AM
Subject: Re: physics trick
> As every visual artist knows, mixing paints is a subtractive color
> process. Mix red and green and you will get a dirty brownish gray.
> Putting colors side by side is an additive process, as when you look
> at your color monitor or TV up close. Combining red and green will
> give you a bright yellowish white.
>
> Hal
>
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