Re: Thanks for info on Namius re Oil and Resinotype

----- Original Message -----
From: "Alberto Novo" <alt_list@albertonovo.it>
To: <alt-photo-process-L@usask.ca>
Sent: Tuesday, May 30, 2006 9:29 AM
Subject: Re: Thanks for info on Namius re Oil and Resinotype

> > I am ,now, speculating as to why Namius decided to incorporate Rosin
(colophony) powder into the pigment mix following his discovery with oil
mentioned in the citation.
>
> Undoubtely, Namias tried many variations before reaching his final
formula.
> Rosin was sometime used -as well as wax- to stiffen the ink: mixing a
resin
> with pigment and a little bit of wax/grease (the British patent has a
> practical example with rosin:dammar:stearic acid:lampblack 100:100:2:80,
and
> I have an idea on why he used these two resins) gives you an "ink without
> oil", whose handling is easier than a very sticky ink.
> BTW, the 1922-1923 recommendations on how to dust the matrix were to pick
up
> the powder with the brush and to gently tap the surface of the paper (so,

I have no idea about Namias' process but it might be important to note that
dichromate does crosslink rosin (similar to shellac)...

Martin
Received on 05/30/06-10:09:32 PM Z