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

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  • $\begingroup$ 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 '16 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 '16 at 22:26
  • $\begingroup$ @DEAD - My bad. VTC retracted. Thanks for the procedural reminder! $\endgroup$ – Todd Minehardt Aug 21 '16 at 22:27
  • $\begingroup$ good point @DEAD $\endgroup$ – szentsas Aug 21 '16 at 23:03
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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.

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