[alt-photo] Re: 1922 Kodak Sulfonic Acid Dye

[Tomas Sobota]

Mustafa,

In my 1925 edition of E.J.Wall's "History of Three Color Photography", Wall
describes a two-color "Kodachrome" process that is very similar. The dyes
were "salts of sulfonic acids, the names and composition never having been
published, and were an orange-red and a blue-green".

Of course, this was written in 1925 or earlier. It is possible that later
Kodak _did_ produce some more information about these dyes, but I'm not
aware of it.

Tom Sobota
Madrid, Spain

On Thu, Jul 1, 2010 at 7:18 AM, Mustafa Umut Sarac <
mustafaumutsarac at gmail.com> wrote:

> I am researching Kodak 1922 - 1927 Two Color Process.
> There are two color dyes applied to either sides of the film.
> As patents described Brownish Yellow and Green.
> These two gives excellent , charming skin colors.
>
> I looked to the end of 19th century to 1930s patents and learned that these
> dyes are salt of sulfonic acid.
> I need exact names. Anyone knows them ?
>
> thank you ,
>
> Mustafa Umut Sarac
>
> Istanbul
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