This study compared split depletion latent prints, aged up to 12 weeks, from multiple donors on a variety of substrates to determine whether 1,8-diazafluoren-9-one should be replaced with 1,2-indanedione-zinc chloride as the Royal Canadian Mounted Police's standard chemical latent print development technique for porous exhibits. It was found that 1,2-indanedione-zinc chloride developed more latent prints, which also appeared to be more brightly fluorescent than those of 1,8-diazafluoren-9-one. The performance of 1,8-diazafluoren-9-one was reduced in high relative humidity; whereas 1,2-indanedione-zinc chloride did not seem to be affected by changes in relative humidity. The solid state laser revealed the most latent prints; however, the MiniCrimeScope and the Polilight were both comparable to the laser. The RCMP is conducting a nationwide field trial to validate this method for casework. (Published Abstract)