Modette21

My 3.75 x 5.75 negatives are curling or not laying perfectly flat for scanning. Does anyone have any suggestions on how to get these really old negatives to lay flat on my Epson Perfection V700 scanner? Or DIY solutions that could help me? It would be nice to not have to use tape because I have about 300+ negatives to scan. However, if your suggestion is to use tape, what kind of tape will work for this situation? Thanks in advance!