The liquids C3F8, C4F10, SF6, C2ClF5, and CBrF3, and mixtures of SF6with C2ClF5have been found to possess a number of desirable properties for use in large bubble chambers, designed primarily for particle decay studies. These properties are relatively short radiation length, convenient operating pressure and temperature, chemical inertness, and nontoxicity. Some properties of TeF6are also discussed.