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a 2.4 volt torch bulb filament fails when the torch focuses on copper metal
then torch filament fails by chemical reaction
which chemical produces or releases a high radiation power
which chemicals apply on copper metal it pulls or grain of rice.
when rice pulls they change to black
rice is made of hydrocarbons. When [copper] pulls [a hydrogen off the hydrocarbon] it makes the rice go black(brownish). It pulls off all hydrogen and leaves carbon behind. carbon is black(brownish).