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Hi Gary,
I was able to demonstrate that it was "NOT" the same ink that was in contact with the emulsion in the wrapped roll of film or after wound onto the takeup spool.
Thoughts I had about the mechanism of how it happened or how the thing that happened caused the issue didn't pan out in experiments.
For example, I thought maybe the unknown agent was offset to the black side of the paper like you say, and in contact with the base may have altered a quality of the anti-halation backing or the black surface itself. I tried by writing on the black surface with a shiny ink pen... my marks didn't show up.
I was able to demonstrate that it was "NOT" the same ink that was in contact with the emulsion in the wrapped roll of film or after wound onto the takeup spool.
Thoughts I had about the mechanism of how it happened or how the thing that happened caused the issue didn't pan out in experiments.
For example, I thought maybe the unknown agent was offset to the black side of the paper like you say, and in contact with the base may have altered a quality of the anti-halation backing or the black surface itself. I tried by writing on the black surface with a shiny ink pen... my marks didn't show up.
sheepness

)
untitled
!
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