Some medicine that we are using are having photosynthesis property it's means it ready to photo chemical reaction. Something this will be lost it it's physical and chemical properties if any light exposed to on it. For example if that a medicine having 2 years of expiry period, that becomes expired with in 4 hours due to the light exposed to the medicine. If we use it, we will get allergies and side effects.Due to this light energy exposed to the drug it become failures it's called photo degradation.
Commonly the ULTRAVIOLET RAYS (UV) have high penetration power. if it exposed to a medicine, that will be losses it's chemical and physical properties.
For an example, take an transferable glass bottle which is filled up with photo synthesis medicine. Here the light energy penetrate the medicine so it become changes its physical and chemical properties.
Every colour have an frequency including the brownish. This amper colour will have very low frequency so this is filtered the all colours and UV rays excluded brown. So this is the reason why the photosynthesis medicine safe in amper colour. Some light transferrable bottles are not affected by photosynthesis process because the medicine will not having photo synthesis property.
Some tablets are also have photo synthesis property so the tablets are safely packed with silver pack (or) brownish packages.
Nice topic
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