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Permissible Ammonium Nitrate explosives introduced in the 1880's but have been modified and improved since that time. Some recent compositions include Favier 2, Favier 2 bis Vilvorde; Favier 3 bis; Favier 4; and Favier Antigrisouteux.
FSTC 381-5042, Handbook of Foreign Explosives (1965)