Description

250 mL brown Pyrex straight-sided bottle with a ground-glass opening and a stopper at the top. The front of the bottle has hydrogen sulfide H2S etched in ground glass. The bottle is housed in its original cardboard box, catalog number 1423, and has a Thomas Scientific Apparatus sticker (likely the supplier) on the box.

This bottle is made of Pyrex, the Corning trade name for borosilicate glass. The Corning Glass Works developed a lead-free borosilicate glass as a consumer product in 1915. Though it was first used in consumer products like pie plates and casserole dishes, WWI-era shortages in laboratory equipment (which were mainly manufactured in Germany) led the company to expand into making laboratory glassware.