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Optical absorption properties of additively colored in calcium vapor andX-irradiated crystals with tysonite structure, LaF3 and CeF3, were studied in1.5-5.5 eV energy range. Photobleaching with 1.9 eV light and dichroism of theabsorption bands were investigated.The absorption band at 3.75 eV with halfwidth of 1.1 eV is observed in X-irradiated LaF3, similar to theVk-centre-bands observed in other fluorides. No such band is observed inX-irradiated CeF3.  In additively colored CeF3 absorption bands at 1.7 eV, 2.15 eV are observed.These bands can be attributed to F centres. Additive coloration upon heating incalcium vapor did not produce any new absorption band in LaF3 crystals whileformation of metallic inclusions, most likely La precipitates were observed.For X-irradiated LaF3 and CeF3, at temperature below 110K the photo-bleachable,dichroic bands are observed: near 2 eV -band perpendicular to c-axis, 2.6-2.7eV -band along c-axis. F centres occupying the vacancies of fluoride F(1)layers in X-irradiated crystals and F-centres occupying all fluoride vacanciesin additively colored crystals are proposed to be observed

F and Vk centres in LaF3, CeF3 crystals