[alt-photo] Re: SALT & COT 320

[Christina Anderson]

Bob,
Your previous message never came through...

I have not used Cot 320 so I may be speaking out of turn, but I have used Arches Platine which if I am not mistaken is similar.
But where there was no coating of gelatine (e.g. at the edge of the paper) the image was pale and blah. So my guess is, you'll get a print but not a very good one, but it will serve the purpose of showing the process.

Is it possible to mix a starch paste and use that as your brush coating (it won't gel at room temp)?  Because starch provides a necessary organic as well, and keeps the silver nitrate on the surface of the paper.  But in my notes starch is not the same as using gelatine or albumen, both of which aid in the reduction of the silver chloride.  Alberto can explain chemically why this may be the case.

This demonstration request reminds me of one I have for this summer--to do a gum demo in 2 hours for a community of people.  Now that part is no problem--I've done a gum demo in that amount of time (in fact Sandy King was at it in Clemson) with tricolor gum, having already prepared a piece of paper with one layer of blue, and one also with one layer of blue/yellow so I only have to do one coat of magenta and get one done and so on and so forth.  But at this workshop, I was asked to make it hands on for the community!  We couldn't figure out how that could happen in two hours so we decided not to do it....and certainly I wasn't asked to size the paper at the demo, wow.  
Chris

Christina Z. Anderson
christinaZanderson.com

On Apr 9, 2010, at 7:55 AM, BOB KISS wrote:

> DEAR LIST,
> 	I posted this yesterday but didn't receive any replies...maybe it
> didn't go though so here it is again...
>             Hi from Barbados!  A quick question…
>             The local Museum has asked me to give a lecture on some of the
> processes used to make some 19th century prints in their collection.  They
> wanted me to demonstrate one of the processes so I opted for a salt print. 
> The trick is that they want me to do everything at the demo except mix the
> solutions (which I will need to do ahead of time): i.e., coat the salt soln,
> dry, coat the silver soln, dry, expose, salt wash bath, wash, tone, fix,
> wash.  That means that I wouldn’t be able to salt the paper ahead of time.  
>       The formulae always use gelatin in the salt solution.  If I use COT
> 320, a well gelatin sized paper, might I get away without putting gelatin in
> the salt solution?  This would allow me to mix it a day or two before the
> demo without the gelatin hardening.
>       Thanks in advance for your suggestions…
>                               CHEERS!
>                                           BOB
> 
>  Please check my website: http://www.bobkiss.com/  
> 
> "Live as if you are going to die tomorrow.  Learn as if you are going to
> live forever".  Mahatma Gandhi
> 
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