Venetian Red, also called Mars Red, is a non-toxic iron oxide pigment used by dyers, painters and craftspersons since the early days of...

Powerful Medici, Borgia, Sforza, Gonzaga and Este families rise to prominence in the Renaissance. Behind the vast artistic innovations...

What exactly causes onions to make a person cry? The answer involves a combination of chemistry and enzymes. The trigger behind the tears...

Congelation is transformation of matter by freezing and crystallization. It's a straightforward process with many nuances. In spiritual...

The Sulfur-Mercury theory, an ancient cornerstone of alchemical thought, exemplifies the duality inherent in alchemy. The relationship...

The Philosophers' Stone or lapis philosophorum is a miraculous legendary substance. It holds secrets to an elixir of life, a cure for...

After the 642 AD Islamic conquest of Egypt, the center of alchemy moves to Muslim lands. Medieval Arab alchemists study and expand upon...

Salt is important from ancient to Renaissance alchemy, and still used today in alchemical projects, dyeing, cuisine and medicine. In...

Alchemy begins with several elements coming together at a crucial time in Alexandria, Egypt. As an international glass center, the city...

Goethite is common but like hematite a remarkable iron oxide mineral. In geology and mineralogy, goethite has piqued the interest of...

Iron is abundant in Earth's crust and one of the seven metals of antiquity . Essential for life, iron can form various oxides and change...

Sulfuric acid (H₂SO₄) is one of the most important chemicals in the world, with many uses from car battery production to fertilizer...

Copperas, iron(II) sulfate or green ferrous sulfate, is a versatile compound in various applications, from agriculture to water...

Dyers, coloring professionals, metal workers and gemologists seek vibrant colors and tones since early civilization. The first use of...

The ancient Greeks are celebrated for their contributions to various fields such as philosophy, mathematics, and medicine. Among their...

Mercurius among the most important figures of the alchemical storybook A vast array of symbols and archetypes populate the path to...

Hematite, an iron oxide mineral, is well-known for its striking metallic luster and deep red to black colorations. Appearing in various...

Hematite, an iron oxide mineral with the chemical formula Fe2O3, is prevalent around the world. Known for metallic luster and red earth...

Hematite, an iron ore with the chemical formula Fe2O3 (ferric oxide), is known for its metallic luster. In earthy form the stone offers a...

Aqua regia, Latin for “royal water,” is a powerful acidic solution known to dissolve noble metals like gold and platinum. It's used in...