Film-Tech Forum ARCHIVE: What would make this type of scratching?

This is topic What would make this type of scratching? in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.

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Posted by Bob Jones (Member # 1756) on 10-07-2009, 07:57 PM:

Emulsion side (agfa print) -- looks exactly as if one blew up a variable density track and scratched it in over the width of the print. Horizontal lines from edge to edge the entire print and with erratic nature again of a variable density track. While the pattern is viewable on the emulsion side - the scratches don't appear as green but rather clear and black on light and dark areas - more prominent as dark colored on light backgrounds.

I have never seen anything like this.

Thanks for any suggestions.

Posted by Ian Parfrey (Member # 5122) on 10-07-2009, 08:13 PM:

Can you scan a few frames and post? Are they actual scratches with depth or latent images?

Ive seen something similar that I feel has something to do with latent exposure to an A.C light source- sort of a "flourescent light fogging".

Cheers
Ian

Posted by Joe Redifer (Member # 3) on 10-07-2009, 08:14 PM:

Possibly the lower loop being too big on a Simplex/Century/Christie-type projector and slapping against the machine.