Antwerp blue

any of several iron-blue pigments, usually containing a considerable amount of extender.
historical examples

antwerp blue is a weaker variety of the same colour containing alumina.
illumination and its development in the present day sidney farnsworth

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having no nucleus. historical examples in anucleate cells there is probably only a single process of layer formation round an infinitely small nucleolus. form and function e. s. (edward stuart) russell