[Alt-photo] Cyanotype chemistry question

Chris Seiberling christopher.seiberling at gmail.com
Sat Jan 25 16:27:27 UTC 2020

Hello photographic chemists (and others):

Mike Ware's 'New' Cyanotype calls for Ammonium iron(III) oxalate-- (NH4)3[Fe(C2O4)3].3H2O. He says this is also known as ferric ammonium oxalate. But I understand ferric ammonium oxalate's formula to be C6H12FeN3O12 ? Is there a practical difference? I’m not enough of a chemist to understand the formulaic implications. 

Thanks, Chris Seiberling

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