If you are asking if it is true that a light pink paint scheme was used for recce Spitfires, then the answer is yes. It was developed to blend in with UV haze at medium level altitude - not "clouds at sunset/rise".
As bersaglieri said, Pink PR Spit's (mainly FR Mk IX) were used at low to medium altitude, the pink blending against haze, at this altitude they were likely to encounter enemy aircraft and were still therefore armed. The high altitude high speed PR Spit's were the dedicated unarmed versions mainly Mk XI and later the mighty Griffon powered Mk XIX in low observable greys which flew the last ever Spitfire mission in 1954. http://www.historyofwar.org/articles...itfire_PR.html
Fighter aircraft and land rovers are nothing, the Brits painted some cruisers, destroyers and other ships pink as well. Apparently Lord Mountbatten was on escort duty in 1940 in a convoy and noticed that one of his ships disappeared from view a lot sooner than the others. That ship happened to be painted in its pre-war colors of a shade of pink. He was so impressed by the effectiveness of the color scheme that he ordered all the destroyers in his group to paint their ships that particular shade of pink! It took off for a while and a lot of other captains started painting their ships pink as well.