Re: Gums a la Demachy and Puyo

Demachy's formula:

gum, 50% (yes) solution
potassium bichromate saturated
3.7 ml (1 dram) of each
Add 2.6g (40 grains) red ochre

Hope I got my grains and drams right; used onlinecoversion.com--neat site!!

Although as Terry says, he "finds it impossible to give any hard or fast
formula but suggests that workers should commence with the following...".

Further it states that M. Demachy does not weigh his colors and all his
beautiful work is produced by one printing.
chris

Christina Z. Anderson
Assistant Professor of Photography
Montana State University
406.994.6219
CZAphotography.com

----- Original Message -----
From: <davidhatton@totalise.co.uk>
To: <alt-photo-process-l@usask.ca>
Sent: Saturday, July 01, 2006 7:04 AM
Subject: Re: Gums a la Demachy and Puyo

> Terry,
>
> Could you post an example on your website for us to see please,
>
> Thanks,
>
> David H
>
> On Fri, 30 Jun 2006 05:29 , TERRYAKING@aol.com sent:
>
>>
>>
>>
>>
>>Recent correspondence about one coat gum prints led me to try our
> 'retro-invention' method in finding a method which would come close to
> reproducing the 'sanguine' prints which, I assume, were made using only
> one
> coat. I did some research in journals of the 1890s but the most
> telling
> comment was from Demachy who said that he never weighed anything out he
> just did
> things until they looked right.
>>
>>
>>
>>My own method was to consider how one might produce a one coat gum using a
> negative which I had been using for platinum printing. It struck me that
> as the
> negative I proposed to use was one more likely to be successful in the
> making of
> a carbon print it would be a worthwhile approach to combine aspects of
> both
> carbon and gum printing. I am delighted to say that it worked. I will
> include the
> approach in my paper on 'retro-invention' at the Photohistory XIII
> conference in
> Rochester in October.
>>
>>
>>
>>Terry
>
>
>
> ---- - Madasafish - Voted Best Heavy Consumer Broadband Provider in the
> 2006 Internet Industry Awards http://www.madasafish.com/
>
Received on 07/01/06-09:04:59 AM Z