Re: Positive Oil prints from positive prints.

Hi John,
The 'negative' behavior of the matrix is a known phenomena; in the book
of C.SYMES & WHALLEY they mentioned it as a result of :
- 'insufficient washing of the bromide print' ( not valid of course in
the case of an oilprint);
- ' due to hard water'
They remedy is cleaning the print with petrol and start again.
I think that is only true for a paper-matrix, cleaning an inked
aluminium sheet I never succeeded in doing this ; I got the impression
as if the ink was really 'etched' in the alu-sheet.
What I find in my 'bible' , a german book written by HARRY BETHKE/ Dr.
A.MEBES from 1920, is the following:
- swelling is not ok, a longer soaking required;
- apart from above the ink is too soft
- too long exposure

last but not least from 'Bromoil printing and Bromoil Transfer' by Emil
Mayer 1923 :
- he explains more or less the same causes as above, especially too
soft ink.
One word to Luis Nadeau's book : thanks to that I made my first
bromoils and I think he made a lot of very useful books , articles,
research etc.; on the other hand I think he uses also the 'copy and
paste' method for processes he did not do himself. Anyway he is a great
source for a lot of alt-process.

What about a cat looking for a warm place on the keyboard?
Cheers,
Henk

On 27 mei 2006, at 12:16, John Grocott wrote:

> Hello again Henk and Witho et al,
>                   In my latest attempt I have come accross this
> phenomenon of the matrix inking up as a negative after exposing thru'
> a negative. It is mentioned in Luis Nadeau's excellent book,
> '' History and Practice of Oil and Bromoil Printing,'' in the section,
> '' troubleshooting  guide for the oil process. ''  It says the cause
> for this has been described as ''unknown''.
>       I am going to try exposing thru' a positive paper print to see
> if it produces a matrix that will ink up as a positive. A new process?
> ?
>       Excessive exposure to white light after the UV exposure or
> during the washing out of the Dichro is suggested as a cause of this.
> Would'nt it be great to exploit this ''problem'' to our advantage ?
> !   Or has it already been done ? ?
>              Any thoughts, you guys ?
>            Cheers. John.
------------------------------------
www.thijs-foto.com
------------------------------------
Received on 05/27/06-06:03:11 AM Z