This is the test for washing. The one I am thinking of is for
residual silver.
Residual Silver Test ST-1 for negatives
ST-1 Stock Solution
Water................100 ml
Sodium Sulfide, anhydrous.........2.0 grams
Life of the stock solution in a stoppered bottle not more
than 3 months.
To use dilute one part stock with 9 parts water. Place a drop
on a clear portion of the negative and allow to stand for 2 to 3
minutes. The blot off with fresh blotting paper. Any stain
indicates incomplete fixing.
The stain chart used for the residual hypo test can be used
for this test.
Life of the diluted test solution is one week.
This is from an edition of "The Kodak Black & White Darkroom
Dataguide" It does not have the Selenium toner version of this
test but refers to Kodak publication F-40 which might have it.
The reason this is specified for negatives is that after a
prolonged time it leaves a permanent stain. It cab be used for
paper too if a sample of unexposed paper is processed with the
prints for purposes of testing.
I have used both this and the KRST version and both work.
This is a good test if you are planning to tone prints in
either a sulfiding toner or KRST (or whatever is sold for the
purpose now).
On 2/16/2021 12:13 PM, Robert Shanebrook (Redacted sender
makingkodakfilm for DMARC) wrote:
I don't recall a test that used Kodak Rapid Selenium Toner for fixing.
In the darkroom we used Kodak HT-2 Test for hypo retention. see attachment.
In Photo Tech in Kodak Park there was also an automated test. The methylene blue test gave a meausure of hypo retention per cm2.
I don't havea recollect
On Tuesday, February 16, 2021, 02:00:19 PM EST, `Richard Knoppow <dickburk@xxxxxxxxxxxxx> wrote:
It seems to me that Kodak had an alternative test for degree
of fixing using KRST diluted (by memory)1:10 This was an
alternative to the sodium sulfide test and was supposed to be
more stable and give stains more like those in the Kodak chart.
Bob Shanebrook might remember or else I will see if I can find
the publication that had this.
On 2/16/2021 6:31 AM, Tim Daneliuk wrote:
> On 2/16/21 6:51 AM, BOB KISS wrote:
>> DEAR ROBERT,
>>
>> I got staining in the whites of my fiber based prints often when I combined the Rapid Selenium Toner with the HCA. Never got it following your sequence below.
>>
>> CHEERS!
>>
>> BOB
>>
>
> Bob -
>
> This was also my experience. I have read that KRST will stain if a
> print is underfixed.
>
> =============================================================================================================
> To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.
--
Richard Knoppow
dickburk@xxxxxxxxxxxxx <mailto:dickburk@xxxxxxxxxxxxx>
WB6KBL
=============================================================================================================
To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.