A description of the six kinds of test paper used is followed by the method for producing fungal stains on these papers. The following reagents for stain removal are then described and their efficiency assessed: sodium hypochlorite (11 methods), bleaching powder (5 methods), sodium chlorite (1 method), chlorine dioxide (5 methods), chloramine T (2 methods), potassium permanganate (9 methods), hydrogen peroxide (2 methods), sodium formaldehyde sulphoxylate (1 method), hydrochloric acid (1 method), citric acid (1 method), oxalic acid (5 methods), ammonium ferric alum (1 method). Of this ensemble, the oxidizing agents were most effective. The effect of the more useful methods on the paper was checked by accelerated ageing tests. Finally, a section deals with a special study on removing grease spots, including the use of solvents (ethanol, ether, naphtha, benzene, turpentine, trichlorethylene), soap and laundering detergents, absorbent powder, and alkalies. The most effective agents were various solvents or an absorbent clay (terre de Sommières). (Published, Bull. Assoc. Technique de l'industrie papetière, 1960, No. 4, 173-183. See IIC Abs. 3-2885 (1961)).