These days you can easily get quite good copies or prints from slide negatives. I am very much just an amatuer in photo processing, but Here's what I do. 1. Scan the negative in high resolution and crop the scan white space to get full page image. 2. Open the scan in a photo program that has the Invert Colour feature. 3. Invert the colours. 4. Use Auto-correct to enhance the result.
What some people don't know is that they don't know enough to know that they don't know anything