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In page Quill:

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Quill pens were the instrument of choice during the medieval era due to their compatibility with parchment and vellum. Before this, the reed pen had been used, but a finer letter was achieved on animal skin using a cured quill. Other than written text, they were often used to create figures, decorations, and images on manuscripts, although many illuminators and painters preferred fine brushes for their work. The variety of different strokes in formal hands was accomplished by good penmanship as the tip was square cut and rigid, exactly as it is today with modern steel pens.[citation needed]