historian Ibn Abi Usaybi'a in his book "Kitab Uyun al-anba fi tabaqat-al-atibba" (Book of Sources of Information on the Classes of Physicians) concerning medicine in which Ibn Abi Usaybi'a attributes the process to an even older author, Ibn Bakhtawayhi, of whom nothing is known.

Ice cream production became easier with the discovery of the endothermic effect. Prior to this, cream could be chilled easily but not frozen. The addition of salt lowered the melting