An aqueous concentrated liquid disinfectant composition which blooms when added to a larger volume of water which comprises the following constituents: a terpene based solvent; germicidal cationic surfactant, preferably a quaternary ammonium compound having germicidal properties; organic solvent constituent; a binary co-solvent system comprising alkyl diphenyl solvent and a co-solvent; one or more nonionic surfactants; optionally but desirably at least one optional constituent selected from: chelating agents, coloring agent, light stabilizers, fragrances, thickening agents, hydrotropes, pH adjusting agents, pH buffers one or more detersive surfactant constituents particularly non-ionic and amphoteric surfactants, as well as others known the art and useful in similar compositions; and, the balance being water. The liquid disinfectant compositions feature good blooming characteristics, particularly good long term blooming retention. Process for the use of the compositions are also disclosed.