An anti-oxidant concentrate for the stabilization of fatty materials is made by extracting an anti-oxidant-containing oil or oil-bearing material with a solvent for the anti-oxidant to obtain an anti-oxidant concentrate and thereafter treating the p  concentrate with a small amount of ammonia.  A fatty material is stabilized against oxidation by treating it in the presence of a small amount of ammonia with an anti-oxidant concentrate obtained by solvent extraction of an oil or oil-bearing material.  Suitable oils and oil-bearing materals are vegetable oils, fish liver oils and oil-bearing materials of animal or vegetable origin, and the anti-oxidant concentrates may be prepared by the processes of Specifications 550,983 and 553,328.  The invention may be applied to the stabilization of fatty oils, fats and the like.  From 0.1 to 20 per cent. of concentrate may be added to the oil or fat, and the mixture is preferably refluxed with a solvent such as a hydrocarbon, halogen hydrocarbon, acetone, diacetone alcohol, or a mixture of acetone and methanol.  In examples, carbon-refined shark liver oil is refluxed with acetone or isopropanol, ammonia or an anti-oxidant obtained by extracting crude corn oil or expeller soya bean oil with isopropanol.ALSO:An antioxidant concentrate for the stabilization of fatty materials is made by extracting an antioxidant-containing oil or oil-bearing material with a solvent for the antioxidant to obtain an antioxidant concentrate, and thereafter treating the concentrate with a small amount of ammonia.  A fatty material is stabilized against oxidation by treating it in the presence of a small amount of ammonia with an antioxidant concentrate obtained by solvent extraction of an oil or oil-bearing material.  Suitable oils and oil-bearing materials are vegetable oils, fish liver oils and oil-bearing materials of animal or vegetable origin, and the antioxidant concentrates may be prepared by the processes of Specifications 550,983 and 553,328.  The invention may be applied p to the stabilization of fatty oils, fats, waxes, soaps, vitamin concentrates, butter, margarine, lard, hydrogenated shortenings, mayonnaise, cakes, biscuits, breakfast cereals, cosmetics containing fatty materials, sulphonated oils, amides, and mono- and di-glycerides.  From 0.1 to 20 per cent of antioxidant concentrate may be added to the oil or fat, and the mixture is preferably refluxed with a solvent such as a hydrocarbon, halogenated hydrocarbon, acetone, diacetone alcohol, or a mixture of acetone and methanol.  In examples, carbon-refined shark liver oil is refluxed with acetone or isopropanol, ammonia and an antioxidant obtained by extracting crude corn oil or expeller soya bean oil with isopropanol. The Specification as open to inspection under Sect. 91 refers also to the stabilization of gasoline, mineral oil, lubricating oils and rubber.  This subject-matter does not appear in the Specification as accepted.ALSO:An anti-oxidant concentrate for the stabilization of fatty materials, such as butter, is made by extracting an anti-oxidant-containing oil or oil-bearing material with a solvent for the anti-oxidant to obtain an anti-oxidant concentrate, and thereafter treating the concentrate with a small amount of ammonia. The fatty material is stabilized against oxidation by treating it in the presence of a small amount of ammonia with an anti-oxidant concentrate obtained by solvent extraction of an oil or oil-bearing material of vegetable, marine or animal origin. The anti-oxidant concentrates may be prepared by the processes of Specifications 550,983 and 553,328, [both in Group IV].ALSO:An antioxidant concentrate for the stabilization of fatty materials such as margarine, lard, shortenings, mayonnaise, cakes, biscuits and breakfast cereals, is made by extracting an antioxidant-containing oil or oil-bearing material with a solvent for the antioxidant to obtain an antioxidant concentrate, and thereafter treating the concentrate with a small amount of ammonia.  The fatty material is stabilized against oxidation by treating it in the presence of a small amount of ammonia with an antioxidant concentrate obtained by solvent extraction of an oil or oil-bearing material of vegetable, marine or animal origin. The antioxidant concentrates may be prepared by the processes of Specifications 550,983 and 553,328.