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Smokeless propellant powder which has colloided nitrocellulose as its main ingredient, and contains no other major energy-producing component. The nitrogen content of the nitrocellulose is usually between 13.1% and 13.2%. In the United States, single base powders contain no nitroglycerine, whereas in some European countries powders containing less than 10% nitroglycerine are considered single base. See Double Base Powder for comparison.