[pure-silver] Re: Hypo Test Sensitivity


----- Original Message ----- From: "Ralph W. Lambrecht" <info@xxxxxxxxxxxxxxxx>
To: "PureSilverNew" <pure-silver@xxxxxxxxxxxxx>
Sent: Tuesday, June 27, 2006 4:43 PM
Subject: [pure-silver] Hypo Test Sensitivity


I'm trying to compare the test sensitivities of HT1 vs HT2. HT1 measures the
residual hypo content of the last wash water using potassium permanganate,
and HT2 measure the residual hypo content of the emulsion using silver
nitrate.

Has anyone used both and can share their experience?





Regards



Ralph W. Lambrecht

http://www.darkroomagic.com


The permanganate test has been obsolete for decades. I measures the amount of hypo in water dripping of a print or film. Since hypo may be bound to the emulsion or the paper the test is very imcomplete. the Silver Nitrate test is better since it test for hypo actually in the emulsion or support. The Methyelene blue test is supposed to be even more accurate but its not very simple.

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 

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