Re: [Histonet] gold chloride

From:John Kiernan

Gold chloride (meaning tetrachloroauric acid or its
sodium salt) does not need to be refrigerated and it 
is not light-sensitive. Aqueous solutions keep for 
years in clear glass bottles on an ordinary shelf.
They slowly deteriorate with repeated use, becoming
paler yellow with a subtle greyish sheen, and should 
then be recycled. 

The recycling method is simple and you recover about
half the original gold chloride. For details, see
Stain Technology 52:245-248 (1977).

John Kiernan
Anatomy, UWO
London, Canada.
Jerry Duncan wrote:
> Fellow histologists,
> We currently prepare gold chloride rather than purchase the prepared liquid.
> Does gold chloride need to be refrigerated after preparation?
> Thanks,
> Jerry
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