“OLEO-5” is most likely referring to a specific hair dye shade from the Schwarzkopf Oleo Intense or Syoss Oleo Intense line, with “5” indicating a “light brown” or a similar light shade, such as the Syoss Oleo Intense 5-10 Frosty Brown or the Schwarzkopf Oleo Intense 5-10 Light Brown. These are ammonia-free, oil-based permanent hair dyes that provide rich, long-lasting color, 100% grey coverage, and supreme hair care through nourishing oils, with a formula that includes the HaptIQ system to reduce breakage.

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