Abstract
SUMMARY: In these pages of the colour theory of the Arabs from ca 650 till about 1300 we treated the ideas of Jacob of Edessa (ca 633-708), Alkindi († 873). Albumasar († 886), Alfarabi (†950), the brothers of Basra (ca 875), Albyrouny (973-1048). Avicenna (980-1037), Alhazen (ca 965 - ca
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