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I can still remember attending one of my first crystallography
seminars
and being shocked at the apparent confusion of the distinguished
speaker
(the late Paul Sigler, IIRC) who inadvertently referred to red as
negative and blue as positive.
i am disturbed that the question didn't get asked. i think it is
important to ask. if a speaker
is presenting something that seems out of normal understanding, if
you don't ask, it
doesn't get clarified. i think the physics student next to you
would have appreciated
a clarification of the different conventions. the question does not
have to be in the
hostile form of "you are wrong for using that color convention", but
can be in the form
of "from my background in physics, red is used for positive charge,
could you confirm
that your convention is to use red for negative charge?"
