Why is chloroform ($\ce{CHCl3}$) kept in dark coloured bottles?

  • $\begingroup$ I'm voting to close this question as off-topic because the answer is quite easily found by typing "why is chloroform kept in dark bottles" into the Google search box. $\endgroup$
    – Todd Minehardt
    Aug 21, 2016 at 18:54
  • $\begingroup$ @Todd lack of research on itself isn't a close reason. You can down vote instead. $\endgroup$
    – M.A.R.
    Aug 21, 2016 at 22:26
  • $\begingroup$ @DEAD - My bad. VTC retracted. Thanks for the procedural reminder! $\endgroup$
    – Todd Minehardt
    Aug 21, 2016 at 22:27
  • $\begingroup$ good point @DEAD $\endgroup$
    – szentsas
    Aug 21, 2016 at 23:03

1 Answer 1


In the presence of UV light, chloroform can be oxidized by atmospheric oxygen to phosgene ($\ce{COCl2}$), a toxic gas. The dark colored glass blocks UV light so that phosgene is not produced.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.