[neut. of L. cæruleus.] (See quots.)
1859. Times, 28 Dec., 2/2. (Advt.) Cæruleum, a new permanent colour, prepared for the use of artists.
1875. Ure, Dict. Arts, I. 570. Cæruleum … consisting of stannate of protoxide of cobalt, mixed with stannic acid and sulphate of lime.
