Harry Thurston Peck, Harpers Dictionary of Classical Antiquities (1898)

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Atramentum

（μέλαν). A term applicable to any black liquid, but specifically used of three coloring substances.

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1.

Atramentum sutorium— blacking for leather.

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2.

Atramentum tectorium or pictorium—a black pigment used by painters.

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3.

Atramentum librarium (μέλαν γραφικόν）—ink, for which see Writing and Writing Materials.