[alt-photo] Re: RES: Re: RES: Re: Temperaprint and preservatives

[Katharine Thayer]

Hi Rafael,
Although I agree with the overall advice that as a dichromated  
colloid process, the  finished temperaprint print should be just as  
stable as a properly exposed and developed gum print (in other words,  
highly stable), I have to quibble with your comment about Chromium  
VI.    If the print is properly exposed and developed, there will be  
no chromium VI in the print.  The print is made of crosslinked  
colloid and as such should be impervious to water and uninteresting  
to bugs; fungus should only be attracted if there's unhardened  
colloid present, which should not be the case with a properly  
processed print.  Varnish should not be necessary as a precaution  
against bugs (and could introduce problems of its own).   I'm aware  
that a tropical climate presents special problems of dampness and  
fungus, but in the damp NW of the US, I had a flood in a garage that  
soaked and ruined several large boxes of framed gum prints.  The  
paper developed mold, but the hardened gum itself did not.
Katharine




On Sep 28, 2010, at 12:11 PM, Rafael Frota wrote:

> Loris
> Thank you for the answer. I thought about it and I have the same  
> opinion.
> Chromium VI is higly toxic and I doubt any fungus (or whatever) can  
> grow in
> a ambient like this. Acrylic varnish will add extra protection to the
> surface and avoid any other problems like mold. Well, I hope so :)
> Here in Brazil is very difficult finding the correct material and I 
> ´m trying
> using alternative tools, like paper (triplex paper instead of  
> yupo). I´ve
> got good results. My fear is about the archival of it.
>
> Thank you a lot
> Regards,
>
> Rafael Frota
> -----Mensagem original-----
> De: alt-photo-process-list-bounces at lists.altphotolist.org
> [mailto:alt-photo-process-list-bounces at lists.altphotolist.org] Em  
> nome de
> Loris Medici
> Enviada em: terça-feira, 28 de setembro de 2010 03:58
> Para: 'The alternative photographic processes mailing list'
> Assunto: [alt-photo] Re: RES: Re: Temperaprint and preservatives
>
> Rafael, I'm not a temperaprint master at all (I only did a couple  
> or so -
> and hated the smell! The process is nice otherwise...), BUT, to my  
> knowing,
> you don't need to put any preservative in the emulsion; exposure and
> crosslinlinking (and finally drying) will denaturalize the tempera. If
> you're overly concerned, put a final varnish layer (which they use  
> for oil
> or acrylic paintings) on top of the print.
>
> Regards,
> Loris.
>
>
> -----Original Message-----
> From: alt-photo-process-list-bounces at lists.altphotolist.org On  
> Behalf Of
> Rafael Frota
> Sent: Tuesday, September 28, 2010 12:41 AM
> To: 'The alternative photographic processes mailing list'
> Subject: [alt-photo] RES: Re: Temperaprint and preservatives
>
> Michael,  Dennis, Mak...
> Thanx a lot for the answer. I´ll be waiting for some light about the
> question...
>
> Peace for all!
> Rafael Frota
>
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