materials

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• 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.
• 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.
• Steel and Alloys Explained: How Carbon and Chromium Work
  Steel is iron with a little carbon, and carbon atoms block the crystal defects that let iron bend, which is why steel is so much stronger than pure iron.
• The Vulcanization of Rubber
  How heating raw rubber with sulfur cross-links its polymer chains — the 1839 discovery that turned a sticky sap into the material of tires, seals, and modern industry.