Like the Lascaux drawings, these have held up over centuries. Iron oxide pigments are a perfect match for painting. Many of the old masters such as Rubens, Rembrandt, and Franz Halls never used more than five to seven colors, mostly iron oxides.
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Restorers used chisels and hi-tech laser technology to scrub grime from the more than 24,000 blocks of stone that make up the 183ft tall tower.
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