How long does the testing liquid last before it expires?

Our reagents come in durable glass bottles. The testing liquid will last a long time (over 4 years) if you store it appropriately. They will expire very quickly if you keep them in warm place or in the sun.


  • Store reagents at a cool temperature. A freezer is ideal. If that’s not possible, try storing at a consistent temperature in the range of 2°–22°C (36°–72°F).
  • Store the bottle upright.
  • Keep out of prolonged direct sunlight.
  • Replace caps immediately and tighten them carefully so that exposure to air and humidity is limited.
  • If you have more than one reagent, avoid switching bottle caps!

Our tests that come in glass ampoules (e.g. purity tests) should be stored at room temperature and are guaranteed for 3 years.