Subject: Does Leather Off-Gas Chemicals

Hi,
I read your answer about how leather was made, and it was very useful. However,
we are going to buy a leather sofa, and are concerned that the chemicals used
during the tanning process will off gas whilst we sit on it. We have chemicals
sensitivities and find it hard to find a safe sofa. 
Will the chemicals off gas as we are sitting on the sofa?
Would it be possible to absorb the chemicals if we sat on the sofa in shorts for
example?
Would an older sofa have off gassed, so that it would now be safe? I.e. how many
years would it take for leather to off gas?

Would be very grateful for an answer. Thanks

Re: Does Leather Off-Gas Chemicals