The RAF did some research a few years ago and came up with black being the best colour for air to air visibility, hence they now paint all of their training aircraft black except for the tips etc. My last aircraft was Fibreglass and white but it did have a couple of black areas ,wing walkways' however these got extremely hot and I would hate to have had the whole aircraft that colour. On a previous white aircraft I covered the leading edges of the wings with silver reflective tape and this was extremely good for visibility. (but I don't know if I should have put this in as a mod?)
In practice there are very few mid-airs however I have a policy of never planning a flight from overhead the field and flying at altitude just higher or just lower than the thousand feet mark. pilots often take a pride in being at the exact height - often a multiple of a thousand foot! so stay out of that zone.
In GA flying KEEP AWAY from glider sites and parachute sites.
My penneth.