Down 1. rising and setting of the sun Py 2. pollution ex 5. blinking of eyes PX 2.M 1. 3. Z R A. O 5. D 6. •R U S B D T
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It is because the bottom part is kept on fire which gives it a black colour.
The inner part also becomes black
sometime.
The outer part if cleaned thoroughly it won't be much black.
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