COBALT The first cobalt blue was discovered by heating cobalt salts mixed with alumina by a chemist in 1802. His aim was to produce a blue comparable to the natural ultramarine, an extremely expensive color obtained from lapis lazuli. Van Gogh was a fervent admirer of the cobalt blue, as can be seen in his painting from 1888, Starry Night. He expressed this interest in a correspondence a few years before painting this work: "Cobalt is a divine color, there is nothing so beautiful to create space around objects"..- Louise
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