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Black Hair Underneath Blonde Trend Guide: Master Techniques and Maintenance in 2026

"The high-contrast "black hair underneath blonde" look—commonly referred to in modern cosmetology as a peek-a-boo underlayer, high-contrast block coloring, or two-tone split placement—combines a lightened blonde crown with a deep jet-black layer along the nape and occipital region. This technical guide explores the color theory, application mechanics, and home-care protocols necessary to execute and preserve this dual-pigment style without color bleeding or chemical breakage. Science of High-Contrast Hair: Levels, Bleed Risks, and Pigment Dynamics Achieving a flawless contrast between Level 1/2 (Jet Black/Natural Darkest Brown) and Level 9/10..."

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