Hair treatments can consist of methods to curl, straighten, bleach, hair loss and dye the hair. These treatments may or may not cause damage to the hair cuticle and shaft. The variates for hair treatments include Absent/Not Apparent, Dyed, Bleached, Permed, Combination, and Other. The variate Absent/Not Apparent refers to hairs that appear to have had no treatment with regard to color and curl. The variate Dyed refers to hairs that show evidence of artificial coloring. The variate Bleached refers to hairs that have been treated to remove the natural hair color. The variate Permed refers to hairs that have been treated to alter the natural curl. The variate Combination refers to hairs that have been treated using more than one of the previously discussed hair loss treatment methods (e.g., some hairs may have been bleached and subsequently dyed during the same treatment process).
The variate Other refers to hairs that appear to be treated, but the observed treatment cannot be categorized as dyed, bleached, or permed.
The result of some treatments may be apparent using light microscopy, while others are not as easily detected. A hair that has been dyed may be apparent by the presence of a demarcation line, or a sharp boundary between the treated portion of the hair and the naturally pigmented newly grown portion. A dyed hair may also exhibit the dye color in the cuticle. A dyed hair also will be apparent by the uniformity of the color distribution. Some hair examiners may recognize a dyed hair based on their observation that the color of the subject hair is not typical of naturally colored hair.
The bleaching of hair may result from an artificial bleaching process, or it may result from natural exposure to the sun. A hair that has been bleached from exposure to sun is often referred to as a solar-bleached hair. A bleached hair may be recognized by the presence of a demarcation line between the treated portion and the naturally pigmented newly grown portion. The bleached portion may contain no pigment granules, or it may contain significantly fewer pigment granules than the natural portion. The demarcation line of solar-bleached hair typically is not as distinct as the demarcation line of artificially bleached hair. Repeated dyeing and bleaching of a hair may result in several lines of demarcation that might render a hair as being
unusual, resulting in a hair comparison that might have greater significance.
Hair Loss Product help the damage to the hair cuticle and shaft.The observation that a questioned hair and known hairs have received the same treatment may add to the strength of a hair comparison, but the widespread use of hair treatments may also limit the significance of the correspondence.
Permanent waved hairs sometimes may have buckles or bends in the hair shaft due to the use of perm curlers. These buckles may present themselves at roughly even intervals along the hair shaft due to the manner in which the hair is wrapped around the curler. Artificially straightened hairs sometimes may be recognized by the simple observation that a straight hair has
a cross-sectional shape (e.g., oval, flat) that is more consistent with curly hair.
The variate Other refers to hairs that appear to be treated, but the observed treatment cannot be categorized as dyed, bleached, or permed.
The result of some treatments may be apparent using light microscopy, while others are not as easily detected. A hair that has been dyed may be apparent by the presence of a demarcation line, or a sharp boundary between the treated portion of the hair and the naturally pigmented newly grown portion. A dyed hair may also exhibit the dye color in the cuticle. A dyed hair also will be apparent by the uniformity of the color distribution. Some hair examiners may recognize a dyed hair based on their observation that the color of the subject hair is not typical of naturally colored hair.
The bleaching of hair may result from an artificial bleaching process, or it may result from natural exposure to the sun. A hair that has been bleached from exposure to sun is often referred to as a solar-bleached hair. A bleached hair may be recognized by the presence of a demarcation line between the treated portion and the naturally pigmented newly grown portion. The bleached portion may contain no pigment granules, or it may contain significantly fewer pigment granules than the natural portion. The demarcation line of solar-bleached hair typically is not as distinct as the demarcation line of artificially bleached hair. Repeated dyeing and bleaching of a hair may result in several lines of demarcation that might render a hair as being
unusual, resulting in a hair comparison that might have greater significance.
Hair Loss Product help the damage to the hair cuticle and shaft.The observation that a questioned hair and known hairs have received the same treatment may add to the strength of a hair comparison, but the widespread use of hair treatments may also limit the significance of the correspondence.
Permanent waved hairs sometimes may have buckles or bends in the hair shaft due to the use of perm curlers. These buckles may present themselves at roughly even intervals along the hair shaft due to the manner in which the hair is wrapped around the curler. Artificially straightened hairs sometimes may be recognized by the simple observation that a straight hair has
a cross-sectional shape (e.g., oval, flat) that is more consistent with curly hair.
Get the RSS feed