From: Richard Sullivan FRPS (richsul@earthlink.net)
Date: 06/01/01-10:25:53 AM Z
David,
Iron is the most likely culprit. Eeensy weensy little pieces of ferrous
metal can cause black spot. I once had client who a case of spots that was
caused by cutting the paper with a box knife and a steel ruler. The knife
shaved invisible particles of iron onto the paper. Had another client who
makes cameras while making prints. Steel wool particles shed off his shirt
onto the paper. A hair dryer grinding up its fan, rusty pipes overhead, all
at one time or another having caused the iron spots. Of course iron in the
paper can cause it too.
--Dick
At 10:08 PM 5/30/2001 +0100, you wrote:
>Hi
>
>The other night I tried to make around five ziatypes from the same negative.
>Of these, three were spoiled by a tiny black mark on a light area of the
>print. The marks were in a different place on each print, and were the size
>of a pin-prick.
>
>I'm not sure what caused these. My first thought was dust, but I assume
>that dust would cause a white spot. I couldn't see any marks on the neg,
>and in any case the spots were in a different place.
>
>Could it be a problem in the coating, although I would have expected to see
>more, and or larger spots?
>
>Or maybe the prints are picking up something when being cleared? I clear
>them in open trays, with changes of citric acid and water.
>
>Any ideas would be most welcome - I may need to carry out more 'print runs'
>and it can be frustrating when it takes more than an hour to make a print,
>only to find a small but annoying flaw.
>
>David Nash
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