[alt-photo] Re: SALT & COT 320

[Christina Anderson]

Bob,

With paper previously salted/gelatinized, I am able to expose and develop for my demos in minutes.  It is a great demo, because the students get to see a yellow/brownish kind of thing turn magically into a full blown yummy chocolately print when it hits the water.  VERY exciting. Have fun. How fun that they are able to do it at a museum. You'll get a WOW factor and also get a bunch of students wanting to learn from you I bet!
Chris

Christina Z. Anderson
christinaZanderson.com

On Apr 9, 2010, at 9:36 AM, BOB KISS wrote:

> DEAR CHRIS & LORIS,
> 	Thanks for your replies.  I also got a reply from Christopher James
> who said that the salt process needed a healthy amount of organic material
> (gelatin in this case) to be active or you will get very flat, pale prints.
> He said that COT didn't have enough.  So I will have to salt the paper ahead
> of time and tell them about it at the lecture/demo.  Easy to describe and
> do.  I can bring the already salted paper and do the two silver nitrate
> coatings Christopher recommended, expose, and process.  Should be able to be
> done in 4 hours.  
> 	Thanks!
> 		CHEERS!
> 			BOB
> 
> -----Original Message-----
> From: alt-photo-process-list-bounces at lists.altphotolist.org
> [mailto:alt-photo-process-list-bounces at lists.altphotolist.org] On Behalf Of
> Christina Anderson
> Sent: Friday, April 09, 2010 11:21 AM
> To: The alternative photographic processes mailing list
> Subject: [alt-photo] Re: SALT & COT 320
> 
> 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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