Permanent bonds - Broken down by chemicals such as perm solution, and can be changed from naturally straight to chemically curly. Permanent disulphide bonds are shown as S-S, Temporary bonds - Weakened and softened by the styling of hair, and they temporarily change the natural state from straight to curly, or wavy to straight. Shown as H-O and - or +, Salt bonds - This type of temporary bond are softened by changes in pH, by the use of weak acids or alkaline. They are reformed by normalizing the pH. Shown as - or + , Hydrogen bonds - These are the main bonds broken down during temporary change. These are broken by heat or water and are hardened by drying or cooling the hair. Shown as H-O, Alpha Keratin - Hair in its natural state of straight, wavy or curly., Beta keratin - Hair when it had been wetted, stretched and dried into its new shape, Hygroscopic - Can absorb moisture from the atmosphere. Finished styles can be effected from humidity changing the hair from beta keratin back to its natural form of alpha keratin., Polypeptide chains - These run inside the cortex and are held together with permanent and temporary bonds.,

Basic Science of Styling and Dressing hair

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