Talk:Blueprint

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The blueprint process

Latest comment: 5 months ago1 comment1 person in discussion

This states that the sheet is washed with an iron solution to form Prussian blue, but the entry Cyanotype says it is just washed with water. Which is correct, or are blueprints different? Chemical Engineer (talk) 07:30, 27 February 2026 (UTC)Reply

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The blueprint process