The Anagen Phase

Anagen phase

Anagen is the active growth phase of hair follicles.The cells in the root of the hair are dividing rapidly, adding to the hair shaft. During this phase the hair grows about 1 cm every 28 days. Scalp hair stays in this active phase of growth for 2–7 years. The amount of time the hair follicle stays in the anagen phase is genetically determined. At the end of the anagen phase an unknown signal causes the follicle to go into the catagen phase.

MATRIX - Around the papilla

Matrix
Around the papilla is the hair matrix, a collection of epithelial cells often interspersed with the pigment producing cells, melanocytes. Cell division in the hair matrix is responsible for the cells that will form the major structures of the hair fiber and the inner root sheath. The hair matrix epithelium is one of the fastest growing cell populations in the human body, which is why some forms of chemotherapy that kill dividing cells or radiotherapy may lead to temporary hair loss. The papilla is usually ovoid or pear shaped with the matrix wrapped completely around it except for a short stalk-like connection to the surrounding connective tissue that provides access for the capillary.

Part 2 of choosing the correct hair color

Cool Category
People who belong to the cool category can have eye color blackish brown, dark brown, grayish blue, dark blue or hazel colored with light flecks. The skin tone can be bronze or brown complexion after tanning, pale complexion with pink undertones or no color, olive complexion, medium complexion with golden undertones, medium complexion with light pink color in the cheeks or no color or dark brown complexion. Such people should go with shiny raven black hair base. Cool blonde shades like mink or icy white also look great. The hair highlights can be of honey, wheat or ash color. Such people can also go with purple or burgundy shades. People who belong to the cool category should avoid blonde, yellow, red or bronze shades.

choosing the correct hair color

Warm Category

People who belong to the warm category can have their eye color golden brown, greenish blue, green, hazel eyes with brown or golden flecks. The skin tone can be freckled complexion, pale complexion with golden or peach undertones, ruddy complexion or brown skin tone with golden or pink undertones. Such people should opt for warm and dark shades of brown. Shades like golden brown and chestnut brown can also look great. Base colors or hair dye of reddish orange or shiny blonde also look great on the warm category people. Best option of highlights are copper streaks, golden brown or golden shades. People belonging to the warm category should avoid blue, purple, ash or beige shades belonging to blonde hair color wheel.

The Cystine Bond

The Cystine Bond

The cystine bond also known as the disulfide bond, sulfur bond, or just S bond is formed by cross-links between cystine residues (amino acids) of the main polypeptide chains. This bond is perpendicular to the axis of the hair and between the polypeptide chains. Because of its position in the hair, it is responsible for the hair's toughness or abrasion resistance. (It actually holds the hair fibers together.) These cross-links are frequent in the hair fiber, with maximum of frequency of one cystine bond every four turns of the alpha helix. This is what enables us to permanent wave the hair.

THE SALT BOND

The Salt Bond

 

The salt bond is also an ionic (electrolytically controlled) bond formed by the electron transfer from the side chain of a basic amino group (an amino acid with an 00C- group) to the side chain of an acidic amino acid, i.e. NH3+. (This is two positive and negative charges attracting one another.) This occurs in a position paralleled to the axis line of the rotation of the helix of the hair. The salt bond is responsible for approximately 35% of the strength of the hair and 50% of the hair's elasticity.

The Hydrogen Bond

The Hydrogen Bond

The first bond we will discuss is the hydrogen bond. This bond is located between the coils of the alpha helix and is responsible for the ability of the hair to be stretched elasticity) and return back to its original shape. The hydrogen bonds allow us to change the shape of the hair temporarily with the aid of water. These bonds are electrolytically controlled and are the most readily broken down and the most readily reformed. These bonds are responsible for approximately 35% of the strength of the hair and 50% of the hair's elasticity (some would argue up to 99.9% of the hair’s elasticity).