regarding platinum toner for argyrotypes and others

[Paul Viapiano <viapiano@pacbell.net>]

Hi all...

Christopher James' book notes a platinum toner for POP prints using citric 
acid and platinum solution (10g citric acid, 7-15 drops platinum solution in 
1,000ml water). Could this same toner be used for argyrotypes?

I know that Loris has talked about palladium toners et al, but I was 
wondering if the above formula would work as well...and while I'm 
here...does anyone have a recipe for a palladium toner that would work for 
argyrotypes?

Thanks! Have a great Monday wherever you are...

Paul