[en] In this experiment, an attempt was made to raise the average Z of a scintillation solution with as little attendant quenching as possible. Since high-Z atoms quench by means of a close encounter, as stated above, such encounters are minimized by the use of alkyl groups substituted on the solvent, solute, and heavy atoms. The aromatic compound 1,2,4-trimethylbenzene (pseudocumene) was used as the solvent; 4,4''-di(5-tridecyl)-p-terphenyl as the solute; and tetrabutyltin as the high-Z material. Various experiments were performed with less protected solvents and heavy atoms. These include benzene, toluene, p-terphenyl, bromobutane, and bromobenzene