[alt-photo] Re: paper (tangent)

[Clay Harmon Website]

In my experience, the 280gsm and the 175gsm BFK have similar dimensional stability. They both shrink slightly and proportionally. For gumovers, I don't add an extra shrinkage step. Since I acidify the paper for the initial pt/pd step, that brief soak seems to be enough.

Clay
On Mar 7, 2010, at 7:37 AM, Trevor Cunningham wrote:

> Is there any correlation between paper weight and shrinkage?
> 
> Diana Bloomfield wrote:
>> I didn't even know Rives had a "super-heavy version" - or were you just kidding?  I can never tell.
>> 
>> I go to our local Jerry's here, and I typically buy the "Rives heavyweight BFK", at 280 gsm, which I really love.   I've been buying various papers there forever, but only just discovered that if you buy 20 of any one thing (anything in the store)-- if it's at least 20 of the exact same thing of whatever it is you're buying (like 20 bottles of Gamblin PVA for instance)-- you get a 20% discount.  I was stunned.   I guess I've always bought less paper than that at any one time, but recently, I bought 20 at one shot-- so I found out about this discount.  They said they'd always offered that (only in the store, I gather, not online)-- a well-kept secret.  But that extra discount on already discounted paper there sure seems like a real bargain to me.   And I really like working with it-- seems to work really well for gum-printing.
>> 
>> Diana
>> On Mar 6, 2010, at 12:44 PM, Paul Viapiano wrote:
>> 
>>> Clay...
>>> 
>>> Exactly what I meant...makes your eyes glaze over!
>>> 
>>> Paul
>>> 
>>> 
>>> ----- Original Message ----- From: "Clay Harmon Website" <clayh at clayharmon.com>
>>> To: "The alternative photographic processes mailing list" <alt-photo-process-list at lists.altphotolist.org>
>>> Sent: Saturday, March 06, 2010 8:33 AM
>>> Subject: [alt-photo] Re: dichromate stain
>>> 
>>> 
>>>> There are still quite a few versions of BFK available. In fact, there is a confusing array weights and variants. For instance, Daniel Smith carries a 250gsm Rives White, and a 270gsm White, not to be confused with the  280 gsm BFK heavyweight. There is also a 175 gsm Rives Heavyweight BFK,  not to be confused with the 115gsm Rives BFK lightweight, or the 180 gsm Velin Cuve Rives BFK.  It is crazy-making to be sure. I like the strangely named 175gsm Rives BFK  Heavyweight for pt and gum. Good wet strength and a nice strong pt print when it is acidified.
>>>> 
>>>> Just saying Rives BFK is not terribly specific when you start digging into all the options available. And I did not even get into the super heavy versions that weigh in at 300+ gsm.....
>>>> 
>>>> Clay
>>>> 
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