>It would be tricky.  The stuff only really tracks changes between a
>field pointed at the paper, and a field paralell to it.  YOu can see
>this in a photo from my site...

Can one still get spray on mag tape developer? I remember we used to get it 
from Burroughs, but I think they were marketing someone elses product under 
their own name. That was great stuff to use for looking at magnetic fields. 

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