Insertion of hydrogen into the hexagonal ammonium tungsten bronze was carried out by electrochemical and "hydrogen spill-over" techniques. The coefficient x = 0.06 in the hydrogen bronze H(x)(NH4)0.3WO3 and the diffusion coefficient of hydrogen D(H) = 2.29 x 10(-17) m2s-1 were found by the hydrogen insertion in the absence of water.