Trusted quality. 1848. For ice cream making. How It Works: When making homemade ice cream, the temperature of the liquid ice cream mixture needs to be lower than 32 degrees F, so that it will freeze. Morton Ice Cream Salt works with crushed ice to create a brine with a melting temperature lower than 32 degrees F. The larger rock salt crystals take more time to dissolve, which allows for gradual cooling of the ice cream. This effectively freezes the mixture to create a delightful ice cream.