1,2-Indanedione - A winning ticket for developing fingermarks: A validation study.

•1500 used train tickets developed by the three leading reagents for amino acids.•A unique composition requires an adjustment of the traditional development procedures.•A new criterion for the potential of fingermark development (PFD) is proposed.•The PFD combines all the partial fingermarks highlighting the sensitivity of the reagents.•The superiority of 1,2-indandeione is demonstrated by both PFD and traditional assessments.