The French for COLOUR. Hence couleur de rose rose-color, pink; borrowed in Eng., a. as adj. rose-colored, roseate; b. as adv. in a rosy light, in an aspect to which fancy lends undue attractions.
1783. H. Walpole, Lett. to Earl Strafford, June 24. I confess my reflections are couleur de rose at present.
1835. Hood, Poetry, Prose, & Worse, xxxiii. Our warfare is deadly and horrid Nor tinted with couleur de rose.
1851. W. R. Greg, Misc. Ess., Ser. II. 143. Not disposed to draw a picture couleur de rose of the condition of our people.