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Topic: oil spots (2 msgs / 37 lines)
1) From: Steve

2) From: cthomas
<Snip>
I know a Guatemalan girl who is a 7th generation coffee grower. Her family
also owns 7 coffee plantations in Guatemala. She tells me that all the oil
originates/comes from a small vein in the center on the flat side. - Steve
<<
Interesting.  The only problem I see with that thesis is that the oil
should concentrate around or along the vein.  The droplets I've seen have
been almost anywhere on the beans with droplets, as I recall.  Also,
there's no apparent mechanism for a uniform coating of the bean and one
batch of beans I roasted way dark were definitely uniformly coated.  I'll
have to be more observant of the lower oil concentrations in the future and
will check out the bean vein geometry.  I remember seeing a reference
somewhere recently that the oil comes from little cavities in the bulk of
the bean.  That works if the beans are porous.  Maybe Tom can enlighten us.
CVheers,
CThomas
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