The potential arising from a gold (silver) atom soluted in a silver (gold) metal is determined from observed residual resistivities. Some phenomena in gold-silver alloys are considered by use of this potential. For the nuclear magnetic resonance relating to the electronic density on the Fermi surface at a nuclear position, the present potential leads to good agreement with existing experiments. The nuclear specific heat of the alloy, which results from the interaction between the electric quadrupole moment of 197Au and the electric field gradient due to the impurity potential, is also considered. It is found that the composition dependence is theoretically given by xAu2(1−xAu) in a high temperature range, where xAu is the atomic fraction of gold atoms in the alloy. From a comparison with experiments the Sternheimer antishielding factor at a gold nucleus is found to be 66