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

[Jacques Kevers]

Alberto,
>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

Best,

Jacques


2012/3/4 Alberto Novo <alt.list at albertonovo.it>

> I am looking for the chemical definition brown ammonium ferric citrate
> given by Clerc. I remember a footnote in:
> Clerc, L.P. (1950) "La Technique Photographique"
> 5th Ed, tome II, Publications photographiques et cinematographiques Paul
> Montel, Paris V, 1950, pp.816-817
> I have had the oppportunity of taking some notes about the empirical
> formula of the green form, but unfortunately I did not save the information
> about the brown one.
> Now I nave not the opportunity to look at Clerc anymore. May you help me?
> Alberto
> www.grupponamias.com
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