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What chemicals do you need to make a blueprint?

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The drawing is then placed over blueprint paper, prepared with a mixture of potassium ferricyanide and ammonium ferric citrate. When the attached drawing and the blueprint paper are exposed to a strong light, the unprotected ferric salt not lying beneath the lines of the drawing is changed to a ferrous salt that reacts with the ferricyanide to form Turnbull's blue.

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Similar questions: What chemicals do they use to create a blueprint? What chemicals are necessary to make a blueprint? What chemicals are necessary to develop a blueprint? What chemicals develop a blueprint? What chemicals are used in the process of making a blueprint? [ Hide these questions ]

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