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What tools did Wilhelm Ostwald develop for measuring and classifying colours?

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Wilhelm Ostwald, a German chemist who turned his focus to colour theory in his later years, developed several tools and methods to advance the scientific study of colour.

His contributions included:

Measurement Instruments: Ostwald developed specific instruments designed for the precise measurement of colours.1
Classification System: He created a sophisticated classification system based on the mixtures of white, black, and high-chroma colours. This system was intended to derive mathematical laws of harmony.12
Practical Application: To support his research and educational goals, he produced physical colour specimens in his laboratory and founded a factory to manufacture paint boxes.1
Educational Resources: He authored several textbooks on the history and theory of colour and actively participated in reforms regarding artistic education.1

By applying a multilevel scientific approach, Ostwald sought to bring order and mathematical rigor to the study of colour, bridging the gap between chemistry and the arts.1