'fraid it's not actually true.
Ethylene works on apples and maybe some other fruit but nothing works on avocados.
That's why 2 things 1) they're so pricey and 2) you can buy the ripe now and nearly ripe packs.
You probably won't believe me but it is true.
I've actually tried this out at home, using about £20 worth of avocados in 3 separate groups cos I was massively sceptical and the simple fact is the avocado skin is just too thick to allow gas permeation.
( blaireau69 , the Cumbrian Travis Bickle., Sat 5 Feb 2011, 21:37, Reply)