[alt-photo] Re: Clerc and am fe citrate

[Alberto Novo]

Thanks, Jacques 

>From Clerc, L.P. (1947) "La Technique Photographique" (IVth edition):
> footnote p 738:
> green : Fe2(C6H5O7)3(NH4)3 = 733
> brown: (OH)3Fe2(C6H5O7)2H2(NH4), 3 H2O = 615

So, in the V edition Clerc wrote a better readable formulation of the brown 
form. 

Alberto
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