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Within a light-cone QCD formalism which incorporates color transparency (CT),coherence length (CL) effects and gluon shadowing (GS) we studyelectroproduction of charmonia off nuclei. In contrast to production of lightvector mesons (rho^0, phi^0) when at small and medium energies CT and the onsetof CL effects are not easily separated, in production of charmonia CT effectsdominate. We found rather large CT effects in the range of Q^2 < 20 GeV^2. Theyare stronger at low than at high energies and can be easily identified by theplanned future experiments. Our parameter-free calculations explain well theNMC data for variation with photon energy of the Sn/C ratio of nucleartransparencies. We provide predictions for incoherent and coherent productionof charmonia for future measurements.Comment: 26 pages including 7 figure

Incoherent production of charmonia off nuclei as a good tool for the study of color transparency