The blueprint process involves the use of:

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(C) The blueprint process is a reproduction technique that uses a light-sensitive iron compound,specifically $ferric \ ammonium \ citrate$ and $potass

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Iron compounds

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(C) The blueprint process is a reproduction technique that uses a light-sensitive iron compound,specifically $ferric \ ammonium \ citrate$ and $potassium \ ferricyanide$. When exposed to light,the iron$(III)$ is reduced to iron$(II)$,which then reacts with the ferricyanide to form an insoluble blue pigment known as $Turnbull's \ blue$ $(Fe_3[Fe(CN)_6]_2)$. Therefore,the correct answer is $C$.

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