Ammoniacum
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Ammoniacum gummi; ammoniacum resin; gum ammoniac | |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Ammoniacum or gum ammoniac is a gum-resin exuded from the several perennial herbs in the genus Ferula of the umbel family (Apiaceae). There are three types of ammoniacum: the gums ammoniac of Cyrenaica, of Persia (the commercial one today), and of Morocco.