In a dedicated flammables cabinet or Flinn Saf-Stor™ Can.
Not meant to be placed into solution.
Aitch-tu-ess cartridges are 1-1/8" x 1" vials. Each vial contains 5 grams of a dry mixture of sulfur, sand, granular asphalt and blue dye. Place entire contents in a test tube. Upon heating, 1250 mL of H2S will be produced.