Why are all the filters for cigarettes earthy yellow?

Materials of different colors are not scolded. Teach you some of the most basic, good cigarettes cigarette filler color a little dark, only poor cigarettes is particularly white kind. There is a good cigarette butts with hand pinch, elasticity is better, poor elasticity general. There is also soaked into the water, good cigarettes absorb less water, poor cigarettes absorb more water. Also, this material is generally not good to judge, we can only judge the quality. The price is expensive will generally be better