Scientists have discovered that an element in Prussian blue, a substance commonly used to give jeans their blue color, ...

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 ...

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 ...