  We consider quantum chromodynamics (QCD) with Nc colors and Nf quark flavors
at finite quark chemical potential mu_q or isospin chemical potential mu_I. We
specifically address the nature of the ``Silver Blaze'' behavior in the
framework of 1/Nc expansion. Starting with the QCD partition function, we
implement Veneziano's Nf/Nc expansion to identify the density onset. We find
the baryon mass M_B and the pion mass m_pi appearing from different order of
Veneziano's expansion. We argue that the confining properties are responsible
for the Silver Blaze in the region of m_pi/2 < mu_q < M_B/Nc. We point out,
however, that Veneziano's expansion brings about a puzzling subtlety along the
same line as the baryon problem in finite-density quenched simulations. We
emphasize that the large-Nc limit can allow for the physical ordering of M_B
and m_pi thanks to the similarity to the quenched approximation, while the
unphysical ghost quarks contaminate the baryon sector if Nc is finite. We also
discuss the ``orientifold'' large-Nc limit that does not quench quark loops.
