here's a simple hack for a flatbed scanner: get a piece of 1/4" white Plexiglas, put it over the item on the scanner bed with the lid up, and shine several lights on it. You may have to run it a few times to figure out any hot spots of too intense light but you should be able to get a nice scan of the neg. Then use a 'negative' function in photo software and you will have a positive image.
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