RE: [SG? No, OT!] Cammo

Assuming your spaceship is crewed by humans or a near 
equivalent, they'll want an internal temperature of somewhere around 
20 degrees centigrade (close enough to 300 kelvins). Thus, their ship 
will be a blackbody emmitter at roughly that temperature.

<schnipps>

you'll probably be 
spotted by your blackbody curve long before you could be spotted 
based on reflected visible light.