Chemistry

Blueprint paper can be made by soaking paper in a brown solution of Fe(CN)6^3- and iron (III) ammonium citrate. Wherever the paper is exposed to bright light, the paper turns blue. Explain why this happens.

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  1. I don't know how much detail you want but here is a fairly good explanation of what goes
    on in the process.
    https://en.wikipedia.org/wiki/Blueprint

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