Claims 1: A moisture-activated material in the form of a coating or film containing: (a) a binder component and (b) a volatile component dispersed in the binder component. Claim 2: The material of claim 1, wherein the binder component contains a polyvinyl alcohol. Claim 4: The material of claim 1, wherein the volatile component contains an antimicrobial compound. Claim 5: The material of claim 1, wherein the volatile component contains a volatile oil. Claim 8: The material of claim 7,Volatile compounds contain 1-methylcyclopropene (1-MCP). 11. Claim 9: for the materials claimed in claim 1, there is no significant release of volatile components under 30% relative humidity,However, it releases 75% to 100% of the ambient temperature and humidity. 11. Claim 11: a method for preparing the materials of claim 1, comprising: (a) dispersing volatile components into an aqueous solution, or dispersing polymeric components together to produce a mixture； (b) fusing the mixture onto a packaging material； (c) Allow the mixture to cure to produce a coating on the packaging material. 11. Claim 24: method of preparing materials for claim 1, including: (a) dispersing volatile components into aqueous solutions or polymeric components； (b) melting mixtures onto solid substrates；And (c) cure the mixture to produce a coating on a solid substrate. Claim 39: a method of preparing materials for claim 1, comprising: (a) dispersing volatile components into an aqueous solution or dispersing polymeric components； (b) melting the mixture onto a solid substrate； (c) curing the mixture to form a coating on the solid substrate； And (d) remove the coating from the solid substrate to produce a film or a film. Claim 55: a method of applying the material of claim 1, including (a) inserting a fresh product into a package； (b) inserting a substrate,Film, film or label inside, on, under or near the package； and (c) sealed or packed to expose the material to the relative high humidity produced by the fresh
