We will measure the 006 forbidden reflection of pure Germanium at the Ge K edge (11.1 keV) at room temperature. Energy and azimuthal scans at fixed HKL will be performed. We will study the resonant reflection and the multiple-diffraction (Renninger) reflections. We will use the 6-circle kappa diffractometer of D2AM and the XPAD area detector. We will follow the experimental procedure already used each year for the Hercules practicals since 2014.