Differences were established between local and foreign pastes, and patterns of ancient exchange were traced. Routine processes were followed in the neutron irradiation, and in the analysis of the spectrogram. Summary of the analytic process is given. Maximum analytical values were obtained for fifteen elements. Figure with multivariant analysis of neutron activated samples, and figure with statistical analysis of orange ceramic are included. The results confirm wide interregional contacts of El Mirador during the late preclassical and late classical periods. For other studies in ceramic composition, see also AATA 19-1679 and 20-717. -- AATA