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

[Peter Friedrichsen]

Re GateauPatent 20,740

Curiosity got the best of me so I had to double 
check this. From Espacanet, the origianl GB pdf 
specifies metallic violet, while if you read that 
section as electronic text by clicking on 
"Description", it specifies methylic violet. The 
only reason I can think of is that there is a 
corrected document that was OCR'd but the 
uncorrected version has been scanned and made 
available when clicking on "Original Document" 
Perhaps your access route gave you the corrected one.

Peter Friedrichsen


At 12:06 AM 23/06/2012, you wrote:
>Hmmm, Peter, my copy of the British patent 
>specifies methyl; however, it is patent 20,740. 
>I actually have about five copies of Gateau 
>patents. The only one that says metallic is this 
>Google one. I wonder if Google's scanner does automatic spelling correction :)
>Chris
>
>Christina Z. Anderson
>christinaZanderson.com
>
>On Jun 22, 2012, at 10:28 PM, Peter Friedrichsen wrote:
>
> >
> > 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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