When some substances are burned, gases with an easily recognizable odor are released. The protein that makes up nails

When some substances are burned, gases with an easily recognizable odor are released. The protein that makes up nails, hair and fur is detected by burning a tissue sample. This is how natural wool fiber is distinguished from synthetic fiber. Compare in the lesson the smell of smoke after blowing out a wax candle and a paraffin one.

The smell of paraffin candle smoke is sharp, this is how toluene and benzene smell, which are formed when paraffin burns. A wax candle does not emit harmful substances during combustion and has a faint honey aroma when burning.