It is likely that unsaturated sites are also complexed and perhaps added to, leading to improved color retention. As with oxides, one cannot replace mixed-metal salts with phosphite esters indefinitely without ill effects. In general-purpose compounding, they are used at about comparable most frequently levels. The most frequently used examples are diaryl monoalkyl, dialkyl monoaryl, and alkylated triaryl phosphites. These have somewhat different solubility parameters and are useful in compatibilizing the overall liquid-stabilizer package. Dialkyl monoaryl phosphite esters tend to be more valuable in conjunction with long- or branched-chain carboxylate salts. Diaryl monoalkyl phosphites