Anti-Human κ Light Chain (bound and free) antibody is obtained from goat antiserum. Immunospecific purification removes all goat serum proteins and immunoglobulins that do not bind to the κ light chain (bound and free). Goat anti-κ light chain is conjugated to fluorescein isothiocyanate (FITC). The antibody preparation is specific for human κ light (human IgA, IgG, and IgM) and free κ light chain (Bence Jones κ myeloma protein). The conjugate shows no reaction with bound or free λ light chains.