Roman cement is the precursor to these coveted materials. The Romans discovered that by adding volcanic ash and pumice to their lime mixture, a remarkably strong compound was created. This “cememt” gains in strength over time especially when exposed to water. Distinguishing it from other mortars.
During the renaissance, artists enhanced lime plaster with marble dust and pigment to create wall frescos. The colors were effectively locked in through hydraulic crystallization resulting in a surface as hard as rock and would last through millennia.
Roman artisans incorporated olive oil soap to the mixtures. This Castile soap played a pivotal role in water resistance. Stearic acid in the soap reacts with calcium hydroxide in lime to produce calcium stearate, a natural water water repellent that coats the surface of Tadelakt. This is living chemistry in action!
The Moroccans beautified their cities in plaster tinted in vibrant colors and first coined the name Tadelakt. This name reflects the extensive rubbing technique involved in its application.
Scagliola, a type of lime plaster often found in Palaces and government buildings is frequently mistaken for solid marble due to its impressive finish. Large columns and friezes made from scagliola showcase the remarkable skill and artistry of this decorative technique.
