Hello Johan, and welcome to APUG.
In order to answer your question, we need to know more about the negatives themselves, rather than any scans you may have of them.
How do they look? Are the thicker parts of the negatives at least partially transparent? Can you see detail in the thinner (shadow) parts?
I don't know if you have seen this site that deals with assessing negatives, but I find it helpful: http://www.ephotozine.com/article/as...negatives-4682
One old-timer's trick was to try to read text through