  We use biquaternion to construct SL(2,C) ADHM Yang-Mills instantons. The
solutions contain 16k-6 moduli parameters for the kth homotopy class, and
include as a subset the SL(2,C) (M,N) instanton solutions constructed
previously. In constrast to the SU(2) instantons, the SL(2,C) instantons
inhereit jumping lines or singulariries which are not gauge artifacts and can
not be gauged away.
