Comparison of three active 1,2-indanedione-zinc formulations for fingermark detection in the context of limited resources and supply chain risks in Seychelles

•Three IND-Zn formulations evaluated for potential adoption by Seychelles Police.•BKA formulation found to be effective and sustainable with minimal modification.•Carrier solvent found to be key factor in formulation cost and sustainability.•Petroleum ether an economical alternative to HFE-7100 with reduced supply risk.•Substitution of methanol with ethanol did not appreciably reduce sensitivity.