Re: Argentum sulfericum

From: Alberto Novo ^lt;[email protected]>
Date: 02/19/04-01:53:13 AM Z
Message-id: <>

Breukel, C. (HKG) wrote:

> I ran across this very old bottle (cork sealed, with wax on top) of
> argenticum sulfericum, or silver sulphate. I now that silversulphate is
> insoluble in water. Is there any practical application for silversulphate in
> alt. photo processes, or should I keep the bottle as a curious paper weigth?
> Thanks,
> Cor

It is silver sulphate, a white crystalline powder which may darken when
exposed to light.
It is only scarcely soluble, about 5 g/l.
It is used in some chemical analyses to remove chloride ions but avoiding
introducing oxidants like nitrate.
I think there are not any alternative techniques using it, however you might
prepare silver oxide boiling it with sodium hydroxide if you know the
dangers of this operation.
You should obtain something less than 0.75 g of silver oxide from 1 g of
silver sulphate.
Silver oxide is used in making argirotypes.

Received on Thu Feb 19 01:53:28 2004

This archive was generated by hypermail 2.1.8 : 03/02/04-11:35:09 AM Z CST