Question

why are medicines kept in dark coloured bottles?​

Answer 1

because some chemicals and medicines decompose in presence of light.so in order to protect they are kept in dark coloured bottles.
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Answer 2

Because some chemicals andmedicines decompose in the presence of light .So in order to protect it , they are stored in coloured bottles. This is because some chemicals are photosensitive meaning that they break down when exposed to light.