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This 30 ml (1 oz.) amber glass Boston round bottle is ideal for storing chemical solutions, most solvents, acids, and bases. The amber glass also prevents decomposition of light-sensitive chemicals. The black phenolic cap has a poly-cone liner for a leak-proof, chemically-resistant seal. The neck and cap size is 20-400. It is also available in other sizes of 60 ml, 125 ml, 250 ml and 500 ml.