First of all, we have to talk about dyeing hair, we all know that we need to use hydrogen peroxide cream and a single dye cream, hydrogen peroxide cream can be divided into 3%, 6%, 9%, 12%, single dye paste can be divided into 3 ° color to 9 ° color, this is to sum up, because some business products are different, so can not be generalized.

Hydrogen Peroxide CREAM:

Hydrogen peroxide cream, also known as developer or oxidizing emulsion, is a mixture of hydrogen peroxide (H2O2) and water, often combined with conditioning agents and stabilizers to create a creamy, easy-to-use formulation. It serves as an oxidizing agent in the hair dyeing process, working synergistically with the single dye cream (or hair colorant) to achieve the desired hair color change.

Functions of Hydrogen Peroxide CREAM:

1. Decolorization: Hydrogen peroxide breaks down the natural melanin pigments in the hair shaft, allowing for the removal of existing color or lightening of the hair before applying the new color. This is particularly important when going from darker shades to lighter ones or when attempting to cover gray hair effectively.
2. Oxidation reaction: When mixed with the single dye cream, hydrogen peroxide initiates an oxidation reaction that transforms the colorless dye intermediates (usually derived from para-phenylenediamine or similar compounds) into colored, larger molecules that can penetrate and bond with the hair cortex, providing lasting color.
3. Hair swelling: Hydrogen peroxide causes the hair cuticle to swell, enhancing the penetration of the dye molecules into the hair shaft, ensuring better color coverage and longevity.

Concentrations of Hydrogen Peroxide CREAM:

Hydrogen peroxide cream is available in various concentrations, typically ranging from 3% to 12%. The concentration determines the strength of the decolorizing and lightening effect, as well as the speed of the oxidation process:

1. 3% (Volume 10): Provides minimal lightening and is generally used for subtle color refreshing or toning, as well as for maintaining already lightened hair colors. It is gentle on the hair and suitable for those with sensitive scalps or fragile hair.
2. 6% (Volume 20): Offers moderate lightening and is commonly used for coloring hair within two shades of the natural color or for covering gray hair. It strikes a balance between effectiveness and gentleness, making it suitable for most hair types.
3. 9% (Volume 30): Provides more significant lightening, ideal for changing hair color by up to three shades or for more extensive gray coverage. It should be used with caution on damaged or fine hair due to its stronger oxidative action.
4. 12% (Volume 40): Offers maximum lightening power and is typically reserved for drastic color changes, such as going from dark brown to blonde, or for heavily resistant gray hair. It is the strongest and most aggressive developer, and should only be used by experienced professionals or under their guidance, as it can cause considerable damage to the hair if not used properly.

Single Dye Creams and Color Degrees:

Single dye creams, also known as hair colorants or hair tints, contain pre-mixed pigments in various shades. They are usually classified according to a color degree system, which indicates the level of darkness or lightness of the color:

1. 3° (Dark Brown): The darkest shades in the range, suitable for those seeking a deep, rich brown color or for covering stubborn grays.
2. 4°, 5°, 6° (Medium Browns): Gradually lighter shades of brown, offering a more versatile range for those who want to stay within the brown spectrum but desire a slightly brighter or warmer tone.
3. 7°, 8° (Light Browns, Dark Blondes): Transition shades between brown and blonde, often used for subtle highlights or lowlights, or for creating a multi-dimensional look.
4. 9°, 10° (Blondes): The lightest shades, suitable for achieving blonde tones or for further lightening hair that has already been decolored or pre-lightened.

When selecting both the hydrogen peroxide milk and single dye cream, it's crucial to consider the desired color result, the current hair condition, and any previous chemical treatments the hair has undergone. Professional advice is invaluable in determining the appropriate combination for achieving the desired color while minimizing potential damage to the hair.