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When you dye or bleach your hair, you’re not simply adding color—you’re engaging in a molecular-level restructuring of the hair shaft.

Human hair gets its color from two types of melanin: eumelanin, which produces brown and black tones, and pheomelanin, which contributes to red and yellow hues.

The combination and concentration of these pigments determine your natural [https://www.instructables.com/member/premiumtress/ hair..."

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Created page with " When you dye or bleach your hair, you’re not simply adding color—you’re engaging in a molecular-level restructuring of the hair shaft. Human hair gets its color from two types of melanin: eumelanin, which produces brown and black tones, and pheomelanin, which contributes to red and yellow hues. The combination and concentration of these pigments determine your natural [https://www.instructables.com/member/premiumtress/ hair..."

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When you dye or bleach your hair, you’re not simply adding color—you’re engaging in a molecular-level restructuring of the hair shaft. Human hair gets its color from two types of melanin: eumelanin, which produces brown and black tones, and pheomelanin, which contributes to red and yellow hues. The combination and concentration of these pigments determine your natural [https://www.instructables.com/member/premiumtress/ hair suppliers in china] color. Most hair dyes work by either coating the surface or chemically reacting with your natural melanin to create a new hue. These non-permanent formulas don’t enter the hair cortex—they simply adhere externally and rinse away after several shampoo cycles. To achieve lasting color, permanent dyes contain tiny molecules capable of slipping past the cuticle and into the hair’s inner layers. Once inside, these molecules react with hydrogen peroxide to form larger, stable pigment molecules that cannot easily wash out. Lightening hair through bleaching is a far more destructive chemical intervention than standard coloring. The bleaching formula relies on hydrogen peroxide activated by ammonia to open the hair and dissolve its natural color. Peroxide swells the hair structure and chemically breaks melanin into harmless, transparent fragments. This lightens the hair, but it also removes the hair's natural protective layer and can leave the hair feeling dry and brittle. The more pigment you remove, the more damage can occur, which is why bleached hair often requires extra care and conditioning. The acidity or alkalinity of hair colorants plays a pivotal role in how effectively they penetrate and bond with the hair. Naturally, your hair maintains a mildly acidic environment to keep the cuticle smooth and sealed. Permanent dyes and bleaches are intentionally alkaline—often pH 8–9 or higher—to force the cuticle to swell and permit penetration. The raised pH causes the cuticle scales to lift, creating pathways for dyes and bleach to reach the cortex. Once coloring is complete, restoring a lower pH helps flatten the cuticle and lock in pigment. The hair’s ability to absorb dye or bleach is directly linked to its porosity, which varies greatly between individuals. Hair that has been previously colored, chemically treated, or exposed to heat and sun tends to be more porous, meaning it absorbs color and bleach faster. Neglecting porosity differences can result in patchy color, brassy tones, or unpredictable lightening patterns. Before full application, stylists test color or bleach on a small strand to gauge timing and outcome. Today’s dyes often include nourishing ingredients such as argan oil, hydrolyzed keratin, and silk proteins to buffer chemical stress. Antioxidants are added to counteract the damaging effects of oxidation, preserving hair integrity during chemical processing. Despite technological improvements, the core truth remains: color alteration = structural compromise, and must be approached with precision. Knowing how dyes and bleach work empowers you to choose smarter products and avoid costly mistakes. Whether DIY or professional, understanding the process lets you avoid over-processing, reduce damage, and extend the life of your color. Your hair is a dynamic, porous protein filament that reacts chemically—treat it as such, and it rewards you with vibrancy and strength.

The Chemistry Behind Hair Dye And Lightening - Revision history