Question

blue print papers have a coating of​

Answer 1

Answer:

HEY MATE

Explanation:

Blueprints use the cyanotype process invented by the astronomer John Herschel in 1842. The paper is coated with a solution of two soluble iron(III) salts - potassium hexacyanoferrate(III) (potassium ferricyanide) and iron(III) ammonium citrate.

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Answer 2

Answer:

mixture of potassium ferricyanide and ammonium ferric citrate