  We study the bulk viscosity of moderately hot and dense, neutrino-transparent
color superconducting quark matter arising from weak-interaction-driven direct
Urca processes. The quark matter is modeled using Nambu--Jona-Lasinio (NJL)
model improved to account for vector and t'Hooft interactions as well as
antisymmetric pairing among the red/green up and down quarks. The unpaired
excitations are the strange quarks and the blue up or down quarks. We compute
the relaxation rates associated with $d$ and $s$-quark decay and electron
capture processes on $u$ quark for blue color. The resulting bulk viscosity for
density oscillations in the 1 to 10\,kHz range shows a resonant peak at $T\sim
5\,\MeV$, and the damping time may drop below 10 ms. This is short enough to
affect the post-merger evolution and is very similar to the damping predicted
in nuclear matter.
