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Unlike the water-based inks used for writing, Gutenberg's printing ink had to be based on which substance?

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Correct answer: Linseed oil

Traditional water-based inks would simply run off metal type without sticking properly. Gutenberg developed an oil-based ink using linseed oil and soot. This thick, viscous mixture adhered perfectly to the metal letters and transferred cleanly to damp paper without smudging or fading. Photo: Hannes Grobe (talk), Wikimedia Commons, CC BY 3.0.

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Source: Wikipedia (CC BY-SA)

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