Leather does not absorb cigarette smoke. When someone smokes in your car, you can still smell it days afterwards, because the smoke has filtered through your fabric seats and into the foam. This is not the case with leather. Leather is elastic and strong, and has a high ripping resistance, unlike fabric materials. Aniline is a dyestuff with which materials such as leather and fabrics are dyed with.
Aniline is a transparent, aggressive dyestuff which dyes the leather and fabrics completely through.
As aniline is a very toxic product, the aniline dyestuff has been replaced by metalcomplex dyestuffs, which have the same characteristics as aniline, but are less dangerous. All chrometanned, leathers including pure aniline, semi aniline, corrected grain, Nubuck, suede, etc., are aniline dyed. Only pure aniline Nubuck and suede leather are exclusively aniline dyed, while semi aniline and corrected grains are dressed with pigmented finishes. Leather adapts its temperature to its environment. When the room temperature is 20 degrees Celsius, leather will seem cold since normal body temperature is 36.7 degrees Celsius.