Thank you for the link Vernon. I must confess I still don't quite understand what is natural about this process. My next raised eyebrow (and where is the emoticon for this I would like to know) was caused by the sentence:

It is at this point that the bean experiences an ethyl acetate wash.

Are we to envisage a long line of coffee beans queuing up for "The Ethyl Acetate Wash Experience", and buying postcards and T-shirts for their friends afterwards?

Bingley

Bingley