Recently I have noticed a circular, about the size of a US quarter, spot appearing in the print sky displaying a magenta color. It doesn't appear during the exposure or even during the processing but only during the final wash. I notice it when I pull it from the 40-minute wash but completely disappears without leaving a trace when the print is dry. My processing is the standard process for salt printing and includes a sodium sulfite bath before the final wash. Can anyone shed some light on this spot?
Thomas
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