Use of low global warming potential (LGWP) solvents for finger print development applications
View Patent ↗Developing compositions are provided herein for use in producing a visibly detectable image of a latent physiological biometric. The developing compositions include a carrier solvent that includes at least one C 3 -C 4 hydrofluorocarbon olefin or at least one hydrochlorofluorocarbon olefin.
1. A developing composition for use in producing a visibly detectable image of a latent physiological biometric, the developing composition comprising:
at least one imaging reagent in a carrier solvent, the carrier solvent comprising at least one C 3 -C 4 hydrofluorocarbon olefin selected form the group consisting of tetrafluoropropene, hexafluorobutene, and mixtures thereof or at least one hydrochlorofluorocarbon olefin.
2. The developing composition of claim 1 , wherein the at least one C 3 -C 4 hydrofluorocarbon olefin or hydrochlorofluorocarbon olefin is selected from the group consisting of 1-chloro-3,3,3-trifluoropropene, cis-1,3,3,3-tetrafluoropropene and cis-1,1,1,4,4,4-hexafluoro-2-butene.
3. The developing composition of claim 1 , wherein the imaging reagent is selected from the group consisting of ninhydrin, hydrindantin, 1,8-diazafluoren-9-one, 1,2-indanedione, and derivatives thereof.
4. The developing composition of claim 1 , wherein the carrier solvent comprises the at least one C 3 -C 4 hydrofluorocarbon olefin or at least one hydrochlorofluorocarbon olefin in an amount of at least about 50% by weight of the carrier solvent.
5. The developing composition of claim 1 , wherein the carrier solvent comprises the at least one C 3 -C 4 hydrofluorocarbon olefin or at least one hydrochlorofluorocarbon olefin in an amount of at least about 70% by weight of the carrier solvent.
6. The developing composition of claim 1 , wherein the carrier solvent comprises the at least one C 3 -C 4 hydrofluorocarbon olefin or at least one hydrochlorofluorocarbon olefin in an amount of at least about 99% by weight of the carrier solvent.
7. The developing composition of claim 1 , wherein the at least one hydrochlorofluorocarbon olefin comprises a chlorotrifluoropropene.
8. The developing composition of claim 7 , wherein the at least one C 3 -C 4 hydrofluorocarbon olefin comprises a C 3 -C 4 hydrofluorocarbon olefin selected from the group consisting of 1,3,3,3-tetrafluoropropene (cis); 1,1,1,4,4,4-hexafluorobutene (cis) and mixtures thereof.
9. The developing composition of claim 1 , wherein carrier solvent comprises an azeotropic mixture of the at least one C 3 -C 4 hydrofluorocarbon olefin and an organic compound.
10. The developing composition of claim 1 , wherein the said carrier solvent comprises a mixture of at least one C 3 -C 4 hydrofluorocarbon olefin and at least one hydrochlorofluorocarbon olefin.