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DEDICATED BROW STAIN ACTIVATOR: Formulated specifically to activate Hi Brow Hybrid Brow Stain, mixed 2:1. 2% PEROXIDE, UK & EU COMPLIANT: Meets current professional-use regulatory standards. DEVELOPS IN 2-10 MINUTES: Fast, adjustable processing time for soft to bold brow colour intensity. PAIRS WITH ANY BROW STAIN SHADE: Works with all four Hi Brow Stain colours for consistent activation. GENEROUS 100ML SIZE: Sized for high-volume professional use across many treatments.