When they left the factory ca. early 1950s, the Il-28 was finished exclusively in what is often called “NMF”; that is to say a clear gloss lacquer over the aluminium skinning.
However, some aircraft which were specified for export to Egypt were painted with that service’s two-colour camouflage in the USSR prior to delivery. Is it possible that the same was done for Chinese examples? I really do not know, alas.