Wilhelm Ostwald

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Wilhelm Ostwald, Farbtonnormen und unbunte Normen, 1923. From Farbkunde, Leipzig, Germany.

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Wilhelm Ostwald, Wertgleiche Kreise, 1923. From: Farbkunde. Leipzig. Source Ostwald was Nobel Laurea

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Wilhelm Ostwald, Farbtongleiches Dreieck, 1923. From the book Farbkunde, Leipzig, Germany. Source

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