What color is each planet?

Question

not including Pluto.

Answer 1

Visual impressions:
Mecury - yellowish. This apparent color is due to atmospheric absorption, as Mercury is generally observed low in the sky. Mercury is actually white.
Venus - Appears brilliant white, is actually slightly yellowish, about the same as Jupiter.
Mars - reddish or orangeish. The apparent color varies with brightness - when Mars is at its brightest, it appears more of a salmon pink. Global dust storms can give it a sort of peach color.
Jupiter - overall sort of cream-colored. Shows a variety of colors in its features under high magnification.
Saturn - tan or yellowish.
Uranus - bluish green.
Neptune - greenish blue.

These are my own subjective impressions, and others may quibble with them.

Answer 2

Most of the images of distant planets like neptune and saturn are assigned colors according to what various gasses and carbon compounds they emit. Mercury is an orangish red color like mars because of the iron content of the planet's crust. We have fairly detailed telescopic images of Jupiter because of it's sheer size. You've seen those photos. Venus is usually characterized as blue, neptune and saturn are regularly portrayed as green, as is uranus. The nasa website has some great detailed images of planets and celestial bodies. You can read about the spectrum assigned to these mostly gasseous bodies there as well. Do some research on Hubble too.