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Suggestions for patterns from scanning negs
These marks are known as Newton rings. They were very common when working on an enlarger with a glass negative carrier. That is why most people preferred a glassless neg carrier.
I would suspect that your curved negs are touching glass somewhere in the scanner (Or maybe even the scan head)
The easiest solution would be to flip the negs over so that they are bending the other way, then flip them back in PS after scanning.
You could also try rewashing them and redrying them but this will depend on the age of the negs. Some never seem to straighten out completely.
Hope this helps.
A preventative approach, as suugested by Ken is likely the best way to go.
The effect of these rings is strong color across the spectrum which manifests itself non uniformly in each channel. The normal channel blending and blurring used in moire (a similar, but less severe phenomenon) will not work here. Cloning is possible but depending on the size of the area affected may not product the best results. Taking two scans with the negative alternately inverted and then blending the two images together may be a workable solution.
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