Or the characteristics of the water used. In a post recently, it was
mentioned that tap water was being used which is very hard in Germany. To
make a true evaluation, all variables must be checked, and the pH and
hardness of water used must be measured. This could make a significant
difference in the results which have been reported.
For example, the water in my area (Central Florida) not only comes from
underground limestone sources, but also includes a fair amount of organic
impurities. I use distilled water for everything but wash water (where a
slight amount of hardness is beneficial) but always do the last rinse in
distilled or deionized water to minimize the effect of the organic materials.
<<sil>>
<silh@iag.net>
<webmaster@psa-photo.org>
Sil Horwitz, FPSA
Technical Editor, PSA Journal
check out <http://www.psa-photo.org>