RE: lith printing formula

Thank you to answer Ryuji,
Confirmed that I can use my formaldehyde instead of the para-formaldehyde,
now I have left to know in what proportion I should use it.
In it formulates it of Chirstina 37,5 gr it is used. of para-formaldehyde.
If I use formaldehyde, what quantity should it use, 37,5 cc.? more
quantity?, less quantity?.
    
Thank you
Pardon for my English, text translated by computer.

-----Mensaje original-----
De: Ryuji Suzuki [mailto:rs@silvergrain.org]
Enviado el: jueves, 22 de junio de 2006 20:50
Para: alt-photo-process-l@usask.ca
Asunto: Re: lith printing formula

From: "Christina Z. Anderson" <zphoto@montana.net>
Subject: Re: lith printing formula
Date: Thu, 22 Jun 2006 11:41:26 -0600

> The recipe calls for powdered paraformaldehyde...a chemist on the
> list may know if it would be OK to substitute a 40% formalin
> solution for the 1000ml water in Part B of the formula...that would
> make it easier! But I don't know if a formalin 40% solution
> contains paraformaldehyde.

Once dissolved in the solution, they do the same thing. It's just that
paraformaldehyde is nonvolatile/nonirritating while handling and so
it's more convenient, but if you are used to handle formaldehyde
solution, you can certainly use it.
Received on 06/23/06-10:42:19 AM Z