Blonderen

Blonderen is the process of lightening hair to achieve a blond shade. The term is used in Dutch and other languages as a verb meaning to lighten hair, and it also describes the practice in beauty contexts. Blonderen can be performed on natural hair to reach lighter tones or on previously colored hair to remove pigment and adjust tone. The resulting shade depends on the starting color, hair condition, and processing time.

Most bleaching relies on oxidizing agents, typically hydrogen peroxide, sometimes with activators such as ammonium persulfate. The chemical action opens the hair cuticle and decolorizes melanin. In professional settings, methods include full-head bleaching, highlights with foils or caps, and newer techniques such as balayage. At-home products exist with lower concentrations and simpler instructions but carry higher risk of uneven results.

Lightening can cause hair to become dry, brittle, or porous, and may irritate the scalp or trigger allergies. A patch test is advised before use. Post-bleach care often emphasizes conditioning, protein treatments, gentle cleansing, and UV protection to maintain tone and integrity. The final shade is also influenced by color toners or fillers.

Blonderen as a term reflects the common language of hairdressing in Dutch-speaking regions, deriving from blond/ blond hair. The practice gained prominence with the spread of peroxide-based hair dyes in the 20th century and has since become a standard option in beauty services worldwide.