A stabilizer mixture containing

A) for example at least one compound of the formula (I) ##STR1##

wherein the radicals R₁, independently of one another, are hydrogen, C₁-C₈alkyl, —O^-, —CH₂CN, C₃-C₆alkenyl, C₇-C₉phenylalkyl, C₇-C₉phenylalkyl which is substituted on the phenyl radical by C₁-C₄alkyl; or C₁-C₈acyl; and

B) magnesium oxide, magnesium hydroxide, zinc oxide, zinc hydroxide or an organic salt of zinc or magnesium, or a hydrotalcite; and

C) either

• (C1) an UV absorber or
• (C2) a pigment or
• (C3) an UV absorber and a pigment.

Such a stabilizer mixture is particularly useful for stabilizing a polyolefin against light-induced degradation.