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18 per cent acetone air oven air present air was passed aldehydes amount of gum Amount of Gum-Forming auto oxidation aviation gasoline Baekeland Bakelite boiling Bureau of Mines c.c. Sample caustic potash cent of gum cent of unsaturation compounds constant weight copper-dish method copper-dish test corrosive current of air deposited developed dryness Erlenmeyer flask evaporating in porcelain formation of formaldehyde Formed in Gasoline four gasolines fused silica gasoline were placed gasoline when stored Glass dish glass evaporating dish gram of gum gum formed gum present Gum-forming Ability heated for 100 heavily cracked gasoline identical samples milligrams of gum mirror instantly motor gasoline naphtha obtained olefin percentage of gum phenol presence of water present in Gasoline Receptacles reflux condenser residual gasoline resin isolated sample of cracked sample of gasoline solubility in sulphuric speed of evaporation steam bath steam distillation Storage Tests study the effect tared dish unsaturated hydrocarbons present