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After trying quite a lot of different papers with
both classical and MW cyanotype I noticed, that all my cyanotypes fades at
drying - just opposite the dry-down. When picture is OK when wet, it
becomes to pale when dries up - let say for minimal one zone.
First I thought that our water contains too much
carbonates, so I washed my pictures whole time in acidified water (with citric
acid) and fading was again there.
Anybody has an explanation of that effect? (I
looked at archives and did't find any answer).
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