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Kinda like super chilling a soda in 2 mins???http://youtu.be/dc9BHiQUpWU
The salt does make it colder. Haven't you ever made homemade icecream you use ice and salt on the ouside of the drum to get the ice cream to freeze up. If the salt doesnt do anything why use it. If you add salt to ice the ice will melt but the salt water from the melted ice is colder than the ice itself