| http://www.w3.org/ns/prov#value | - Salt combinations of this type are commercially available from such suppliers as Heatbath Corporation, Detroit, Mich., USA; and Hubbard-Hall Inc., Inman, S.C., USA. An example of a suitable commercial salt mixture is QUICK CURE 275 of Hubbard-Hall, Inc., the main components of which are potassium nitrate (approximately 50% by weight), sodium nitrite (approximately 30% by weight), and sodium nitrat
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