[alt-photo] Re: PVA addn. to pt/pd soln.

[Diana Bloomfield]

Thanks for the explanation, Bob..  Never heard of that, but I'm gonna  
try it now and see what happens.  I've been using PVA, undiluted, for  
coating on BFK Rives paper-- one thin coat which works like a charm  
for me-- and has made *most* of my problems disappear-- but never  
heard of using it in a pt/pd emulsion.  But now I'm gonna put in a  
drop or two next time I make a pt/pd print and see what happens.

The only time I've ever experienced the bleeding that you mention is  
when my developer (potassium oxalate) was weak, or perhaps  
contaminated.  I was never sure which it was.  It's happened to me a  
couple of times, and each time I just started over with the developer,  
which is where I always thought the problem was-- and things seem to  
be fine after that.  I do seem to have to use a lot more potassium  
oxalate to water than what I often see suggested, though.

Diana
On Dec 16, 2009, at 9:48 AM, BOB KISS wrote:

> DEAR LORIS & DIANA,
> 	Many years ago when I started pt/pd printing I wasn't getting the
> D-max I hoped for using on the Lenox paper I was using at that time.
> Someone on the list suggested a drop or two of PVA in the coating  
> solution
> and it worked wonders:  Good D-max and no bleeding.
> 	Well, as J. R. R. Tolkien said, "Old Hobbits die hard!" so I
> continued using it when I switched to Cranes Platinotype again getting
> excellent results:  Good D-max and no bleeding.  I simply continued  
> since I
> have been mostly using COT 320 for the last 5 years.  Excellent D- 
> max and no
> bleeding before this last week.  This strongly indicates that  
> something has
> changed just recently.
> 	I have changed the following and the bleeding is gone:
> 1) I made certain that the paper was completely dry before re- 
> humidifying.
> I had gotten a little lazy about this.
> 2) I more carefully controlled my Dev temp (I let it get a little  
> too warm
> on the print that bled).
> 3) I reduced the PVA by one drop per 11X14 coating volume.
> 	As my 3 year old daughter says, "Awww gone!"  No more bleeding.
> 	Do I need the PVA with COT 320?  Perhaps not but it isn't "broken"
> so I am not going to "fix it".  The bleeding could just as easily  
> been from
> not fully drying the paper as from anything else.
> 		HOLIDAY 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
> Diana Bloomfield
> Sent: Wednesday, December 16, 2009 10:02 AM
> To: alt-photo-process-list at lists.altphotolist.org
> Subject: [alt-photo] Re: PVA addn. to pt/pd soln.
>
> I was wondering the exact same thing.  I'm really curious.  I've never
> heard of using PVA to coat pt/pd-- and especially, as Loris says, on a
> paper like COT320.   I would think that alone might be the source of
> any coating/bleeding problem.  ??
>
> Diana
>
> On Dec 16, 2009, at 7:43 AM, Loris Medici wrote:
>
>> What is the purpose of adding PVA into pt/pd solution - especially
>> for a
>> hard paper like COT320?
>>
>> Regards,
>> Loris.
>>
>> -----Original Message-----
>> From: alt-photo-process-list-bounces at lists.altphotolist.org On
>> Behalf Of BOB
>> KISS
>> Sent: Wednesday, December 16, 2009 2:24 PM
>> To: alt-photo-process-list at lists.altphotolist.org
>> Subject: [alt-photo] Re: BLEEDIN' PT/PD PRINTS
>>
>> ...
>> I use 2 drops of PVA in enough soln to coat an 11X14 sheet of COT
>> 320.  Good
>> or bad?
>> ...
>>
>> -----Original Message-----
>> From: alt-photo-process-list-bounces at lists.altphotolist.org On
>> Behalf Of
>> Christina Anderson
>> Sent: Tuesday, December 15, 2009 10:49 AM
>> To: alt-photo-process-list at lists.altphotolist.org
>> Subject: [alt-photo] Re: BLEEDIN' PT/PD PRINTS
>>
>> Bob,
>> How much PVA are you adding to the coating solution?
>> ...
>>
>> _______________________________________________
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