how to understand the “acid” and “pitch”？
An insanely compelling page-turner....The Casual Vacancy is a comedy, but a comedy of the blackest sort, etched with acid and drawn with pitch....
how to understand the “acid” and “pitch”？ metaphor or what？
The sentence means to show the intensity of "dark" element in the comedy. There is comdesy by a very dark comedy. So dark that it seems to be etced with acid and drawn with pitch.
An acid eats into everything and etching (http://en.wikipedia.org/wiki/Etching) a metal with acid shows the intensity of it. Pitch is black, and drawn with pitch is another way to show how dark it is.
This is an often used style in writing that uses some really intense and strong metaphors to further intensify our communication.
October 16, 2012
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