Colloidal thallium is formed in the radiolytic reduction of Tl ions in the presence of poly ethyleneimine as stabilizer. The colloidal particles 20 30 angstrom form aggregates, whose optical absorption ranges over the whole visible range of wavelengths. The aggregates disintegrate into the small particles, when OH ions are adsorbed and during their dissolution under the influence of H ions. The sol which is formed at pH 11 consists of the separated small particles, the absorption spectrum lying essentially in the UV as expected from the dielectric properties of the compact metal
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Ершов et al. (1993) studied this question.