painting

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• Fresco Painting: How Artists Paint Into Wet Plaster
  Fresco is painting with pigment mixed in water onto wet lime plaster, so the colour is locked into the wall as the plaster dries and hardens, making it durable.
• Impressionism and Color Science: How the Eye Mixes Paint
  Impressionist painters placed separate strokes of pure color that the eye blends at a distance, because light mixes by adding while paint mixes by subtracting.
• Why Was Ultramarine So Expensive? Lapis Lazuli Explained
  Ultramarine was a deep blue pigment ground from lapis lazuli, and its cost came from scarce stone and a slow purification that yielded little pure blue.