Adilson Dias da Silva (adilson.dasilva@mare.gov.br)
Wed, 19 May 1999 18:27:59 -0300
Dear Charles,
Thank you!
adilson
-----Mensagem original-----
De: postmaster@mediaworkshop.demon.co.uk
[mailto:postmaster@mediaworkshop.demon.co.uk]
Enviada em: Quarta-feira, 19 de Maio de 1999 17:07
Para: alt-photo-process-l@sask.usask.ca
Assunto: Re: Chemical product: Cachin
>Would anyone know what product is Cachin in english or portuguese language?
>It is a developer ingredient of a formula from a old Espanish book.
>So Cachin is a spanish name for the product.
>Thanks
>
>Adilson Dias da Silva
Cachin is probably better known as pyrocatechin or catechol
(orthodihydroxybenzene) C6H4(OH)2. It was introduced as a developer by J.M
Eder and Toth in 1880. The plate or needle like crystals are usually
translucent and smell strongly of "coal tar".
It readily oxidises and has a tanning effect on gelatin (similar, but not
interchangeable with pyrogallol) It is used as a developing agent in the
"Windisch Extreme Compensating" monochrome developer.
Regards .......Tony McLean
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