[alt-photo] Re: casein+ alt to dichromate

[Peter Friedrichsen]

That patent has a translation error. The US and 
Great Britain patents specify  metallic violet 
(line 52) as a visible light sensitizer dye, but 
the french patent specifies "violet de méthyle" 
which is methyl violet, a well known dye. 
Metallic violet doesn't exist, or perhaps only in the subconscious ; )

I came across this error when exploring dyes for 
use as visible light sensitizers in gum and casein emulsions.

Peter Friedrichsen

At 04:31 PM 22/06/2012, you wrote:

>On 20 jun. 2012, at 19:47, Peter Friedrichsen wrote:
>
> > Looks like you got it all to work. Congrats on that.
>
>
>Chris (thanks again!) pointed me off-list to 
>this patent of J T Gateau,  she spotted somewhere:
>
>http://www.google.com/patents/US905306?printsec=abstract#v=onepage&q&f=false
>
>Ferric caseïn avant la lettre: the original patent was filed in 1907!
>
>-k
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