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Bubble in glass products is one of principal defects and of major concerns in the glass industry.Some of bubbles are caused by electrochemical reaction in the glass production.In an attempt to identify the bubble generation potential in soda-lime silicate glass (SLS) melts with different fining agents (SO3, SnO2, Sb2O5), direct current voltage is applied between working and counter electrode in a silica crucible and bubble generation on the electrode is confirmed by high-temperature observation (HTO) system.