You can actually get quite good copies of slides by projecting them and then photographing the projected image. A proper slide scanner with enough resolution to do a proper job will cost an arm & leg. Once you have a digital pic of the screen you can manipulate colour balance/ saturation etc
I did this and the final copies were better quality than the copies I made using a neg scanner attachment on a scanner.
I guess the same applies for negatives - but will confess I have never done the job with negatives.
5 Precepts of Buddhism seem appropriate. Refrain from taking life. Refrain from taking that which is not given. Refrain from misconduct. Refrain from lying. Refrain from intoxicants which lead to loss of mindfulness