and examine the ash. BLUE COLORS.—These may consist of indigo, logwood, prussian blue or ultramarine. Indigo blue is fixed on cloth in various ways,—1st, in the blue vat; 2nd, as so-called ...

Should you decorate with navy blue, indigo, cobalt, or Prussian? I took a look back at its history, speaking with art, design, and color experts to find out. Here's what I learned. There are many ...

(Scientists have since figured out how to recreate the process.) Before Prussian blue was discovered, painters had to use indigo dye, smalt, or the pricey ultramarine made from lapis lazuli for ...

The pigment Prussian blue consists of iron cations, cyanide anions, and water. The empirical formula—minus the water of crystallization—is Fe 7 (CN) 18. This seems odd with respect to the iron ...

Crushed into a fine powder, this mineral yielded a lavish indigo that proved impossible to emulate by chemical means until the eighteenth century, when the Swiss pigmenter Johann Jacob Diesbach ...

Researchers at the University of Tsukuba have discovered a phenomenon—applying pressure to a copper-chromium Prussian blue analog, which is a compound featuring crystal voids, causes the ...