Zaffre (zaffer) is a vibrant deep blue pigment developed by alchemists, major pigment creators, by c. 1550 AD. Characterized by brilliant...

Copper (II) sulfate CuSO4 yields a vivid color and widespread applications. Also known as blue vitriol in alchemy and chalcanthite in...

Exquisite gems, sapphires are beautiful stones known for stunning colors and unique properties. Greeks wear sapphire for guidance when...

Indigo, deep blue dye from the Indigofera tinctoria plant, often associated with blue denim, is one of humanity's oldest dyes. The...

Lapis lazuli or "blue stone" is prized for its depth and brilliance in paint as the color ultramarine. Before the 1800s, ultramarine...

Alchemy symbolism is an ancient and fluctuating system of intertwined elements compounded over more than 2000 years. A cornerstone of...

Woad ( Isatis tinctoria ) is a plant yielding a blue pigment used in dyes, paint and medicine. A member of the mustard family, it's also...