Hair and the Chemistry of Color
A History...
People have been coloring their hair for thousands of years using plants and minerals. Some of these natural agents contain
pigments (e.g., henna, black walnut shells) and others contain natural bleaching agents or cause reactions that change the color of
hair (e.g., vinegar). Natural pigments generally work by coating the hair shaft with color. Some natural colorants last through
several shampoos, but they aren't necessarily safer or more gentle than modern formulations. It's difficult to get consistent results
using natural colorants, plus some people are allergic to the ingredients.
The first safe commercial haircolor was created in 1909 by French chemist Eugene Schuller, using the chemical
paraphenylenediamine. Hair coloring is very popular today, with over 75% of women coloring their hair and a growing percentage
of men following suit.
How does haircolor work? It's the result of a series of chemical reactions between the molecules in hair, pigments, as well as
peroxide and ammonia, if present.
About Hair Chemistry...
Hair is mainly keratin, the same protein found in skin and fingernails. The natural color of hair depends on the ratio and quantities of
two other proteins, eumelanin and phaeomelanin. Eumelanin is responsible for brown to black hair shades while phaeomelanin is
responsible for golden blond, ginger, and red colors. The absence of either type of melanin produces white/gray hair.
The Different Types of Color
Temporary Hair Color
Temporary or semi-permanent haircolors may deposit acidic dyes onto the outside of the hair shaft or may consist of small pigment
molecules that can slip inside the hair shaft, using a small amount of peroxide or none at all. In some cases, a collection of several
colorant molecules enter the hair to form a larger complex inside the hair shaft. Shampooing will eventually dislodge temporary hair
color. These products don't contain ammonia, meaning the hair shaft isn't opened up during processing and the hair's natural color
is retained once the product washes out.
Permanent Hair Color
The outer layer of the hair shaft, its cuticle, must be opened before permanent color can be deposited into the hair. Once the cuticle
is open, the dye reacts with the inner portion of the hair, the cortex, to deposit or remove the color. Most permanent hair colors use
a two-step process (usually occurring simultaneously) which first removes the original color of the hair and then deposits a new
color. It's essentially the same process as lightening, except a colorant is then bonded within the hair shaft. Ammonia is the alkaline
chemical that opens the cuticle and allows the hair color to penetrate the cortex of the hair. It also acts as a catalyst when the
permanent hair color comes together with the peroxide. Peroxide is used as the developer or oxidizing agent. The developer removes
pre-existing color. Peroxide breaks chemical bonds in hair, releasing sulfur, which accounts for the characteristic odor of haircolor.
As the melanin is decolorized, a new permanent color is bonded to the hair cortex. Decolorizing dark hair creates warm undertones
that become more visible as the color is released. Use of color conditioners and protective products are essential to maintain the
color.
How Lightening Works
Bleach is used to lighten hair. The bleach reacts with the melanin in hair, removing the color in an irreversible chemical reaction.
The bleach oxidizes the melanin molecule. The melanin is still present, but the oxidized molecule is colorless. However, bleached
hair tends to have a pale yellow tint. The yellow color is the natural color of keratin, the structural protein in hair. Also, bleach
reacts more readily with the dark eumelanin pigment than with the phaeomelanin, so some gold or red residual color may remain
after lightening. Hydrogen peroxide is one of the most common lightening agents. The peroxide is used in an alkaline solution, which
opens the hair shaft to allow the peroxide to react with the melanin.
Levels of Color
Levels are the degree of "lightness or darkness" of a color that is "reflected or seen" by the eye. Hair color is assigned a Level
'number' from 1 to 10 with 1 being black and 10 lightest blonde.
In other words, black reflects very little light and lightest blonde reflects the greatest amount of light. A level 10 blonde would be
'two steps lighter' than a level 8 blonde. This system of levels applies to all colors and almost all brands commonly found.
Ask a Professional
To find the color that best compliments your color and lifestyle, consult a professional. Consultations are no-cost, no-obligation
with Karla. Call 707-591-4332.
For more information, go to http://www.salonweb.com/pro/color.htm
A History...
People have been coloring their hair for thousands of years using plants and minerals. Some of these natural agents contain
pigments (e.g., henna, black walnut shells) and others contain natural bleaching agents or cause reactions that change the color of
hair (e.g., vinegar). Natural pigments generally work by coating the hair shaft with color. Some natural colorants last through
several shampoos, but they aren't necessarily safer or more gentle than modern formulations. It's difficult to get consistent results
using natural colorants, plus some people are allergic to the ingredients.
The first safe commercial haircolor was created in 1909 by French chemist Eugene Schuller, using the chemical
paraphenylenediamine. Hair coloring is very popular today, with over 75% of women coloring their hair and a growing percentage
of men following suit.
How does haircolor work? It's the result of a series of chemical reactions between the molecules in hair, pigments, as well as
peroxide and ammonia, if present.
About Hair Chemistry...
Hair is mainly keratin, the same protein found in skin and fingernails. The natural color of hair depends on the ratio and quantities of
two other proteins, eumelanin and phaeomelanin. Eumelanin is responsible for brown to black hair shades while phaeomelanin is
responsible for golden blond, ginger, and red colors. The absence of either type of melanin produces white/gray hair.
The Different Types of Color
Temporary Hair Color
Temporary or semi-permanent haircolors may deposit acidic dyes onto the outside of the hair shaft or may consist of small pigment
molecules that can slip inside the hair shaft, using a small amount of peroxide or none at all. In some cases, a collection of several
colorant molecules enter the hair to form a larger complex inside the hair shaft. Shampooing will eventually dislodge temporary hair
color. These products don't contain ammonia, meaning the hair shaft isn't opened up during processing and the hair's natural color
is retained once the product washes out.
Permanent Hair Color
The outer layer of the hair shaft, its cuticle, must be opened before permanent color can be deposited into the hair. Once the cuticle
is open, the dye reacts with the inner portion of the hair, the cortex, to deposit or remove the color. Most permanent hair colors use
a two-step process (usually occurring simultaneously) which first removes the original color of the hair and then deposits a new
color. It's essentially the same process as lightening, except a colorant is then bonded within the hair shaft. Ammonia is the alkaline
chemical that opens the cuticle and allows the hair color to penetrate the cortex of the hair. It also acts as a catalyst when the
permanent hair color comes together with the peroxide. Peroxide is used as the developer or oxidizing agent. The developer removes
pre-existing color. Peroxide breaks chemical bonds in hair, releasing sulfur, which accounts for the characteristic odor of haircolor.
As the melanin is decolorized, a new permanent color is bonded to the hair cortex. Decolorizing dark hair creates warm undertones
that become more visible as the color is released. Use of color conditioners and protective products are essential to maintain the
color.
How Lightening Works
Bleach is used to lighten hair. The bleach reacts with the melanin in hair, removing the color in an irreversible chemical reaction.
The bleach oxidizes the melanin molecule. The melanin is still present, but the oxidized molecule is colorless. However, bleached
hair tends to have a pale yellow tint. The yellow color is the natural color of keratin, the structural protein in hair. Also, bleach
reacts more readily with the dark eumelanin pigment than with the phaeomelanin, so some gold or red residual color may remain
after lightening. Hydrogen peroxide is one of the most common lightening agents. The peroxide is used in an alkaline solution, which
opens the hair shaft to allow the peroxide to react with the melanin.
Levels of Color
Levels are the degree of "lightness or darkness" of a color that is "reflected or seen" by the eye. Hair color is assigned a Level
'number' from 1 to 10 with 1 being black and 10 lightest blonde.
In other words, black reflects very little light and lightest blonde reflects the greatest amount of light. A level 10 blonde would be
'two steps lighter' than a level 8 blonde. This system of levels applies to all colors and almost all brands commonly found.
Ask a Professional
To find the color that best compliments your color and lifestyle, consult a professional. Consultations are no-cost, no-obligation
with Karla. Call 707-591-4332.
For more information, go to http://www.salonweb.com/pro/color.htm
| The Color Wheel |
Color and Hair Science
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