  We investigate the optical properties of bromine intercalated highly
orientated pyrolytic graphite (Br-HOPG) and provide a novel interpretation of
the data. We observe new absorption features below 620 meV which are absent in
the absorption spectrum of graphite. Comparing our results with those of
theoretical studies on graphite, single and bilayer graphene as well as recent
optical studies of multilayer graphene, we conclude that Br-HOPG contains the
signatures of ultrapure bilayer, single layer graphene, and graphite. The
observed supermetallic conductivity of Br-HOPG is identified with the presence
of very high mobility (~ 121,000 cm2V-1s-1 at room temperature and at very high
carrier density) multilayer graphene components in our sample. This could
provide a new avenue for single and multilayer graphene research.
