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

[Kees Brandenburg]

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