[alt-photo] Re: Question for Platinum/Palladium printers

[KISS BOB]

I find it very interesting that, a few weeks ago, I begged 
the list for tests to make sure my clearing was thorough
and I received one or two responses suggesting using blue 
light.  Suddenly, below, there are a list of sites 
suggesting tests!  What am I?  Chopped liver?
              BOB

On Fri, 30 Dec 2011 19:42:02 -0500
  etienne garbaux <photographeur at nerdshack.com> wrote:
> Denny wrote:
> 
>>I'm using 3% citric acid for 5 minutes followed by HCA 
>>with Stonehenge and
>>it seems to be working.  I mask the negs for white 
>>borders and the borders
>>look clear.  Is there a more definitive test for residual 
>>iron that should
>>be used?
> 
> Definitely, if you want some assurance that your prints 
>are archival -- visible clearing tells you nothing about 
>that.  There are a number of old tests that work, but a 
>modern method used by conservators is discussed here:
> 
> http://www.apug.org/forums/forum42/89406-residual-iron-test.html
> 
> http://www.irongallink.org/images/file/pdf%201%20_iron_ii_test__ok.pdf
> 
> http://www.irongallink.org/images/file/pdf%202_preparation%20of%20ascorbic%20acid_ok.pdf
> 
> http://www.irongallink.org/images/file/pdf%203_fe%20test%20artikel.pdf
> 
> http://www.irongallink.org/images/file/icom14_161.pdf
> 
> 
> Also, Dequest (http://www.dequest.com/) reportedly makes 
>some iron sequestering agents that are strong enough to 
>solubilize insoluble iron complexes.  Some of these may 
>be suitable for clearing iron-based prints, assuming that 
>they have no deleterious side effects, but I am not aware 
>of any testing having been done for this application.
> 
> Best regards,
> 
> etienne
> 
> 
> 
> 
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