Know whats a Hair dye and hair Dying tips
More than half of people over age 50 have gray hair, but you’dnever know it. More people dye their hair using Hair dye to look younger than do any other age-defying beauty enhancement. But if you want to keep your hair as long as possible, it pays to be careful with dyes,because improper use of Hair dye can do permanent damage toyour hair.
Graying generally starts at the temples and then spreads to otherparts of the scalp.
Dyeing your hair can take years off you — but it can also be badfor your hair. Plant-based dyes such as henna are less likely tocause irritation, but the color doesn’t last as long as if you usechemical dyes.
Most commercial Hair dye today contain the chemical para- Phenylene di amine (PPD)
as an active ingredient. It’s not uncommonto develop skin sensitivity to permanent dyes containing PPD,so be sure to test the product on a small area before covering yourwhole head with hair color for the first time.
How dyes work
Hair dyes can be either permanent or semi-permanent. Both areeasy to apply at home, reasonably inexpensive, and very popular,but can also be damaging to your hair, especially if they’re notused properly.
Settling for semi-permanent
Semi-permanent Hair dye are acidic and are made of small moleculesthat can pass through the scales of the cuticle and into the haircortex. These dyes are water-soluble and easily washed out. Theymay last from one to six weeks, depending on what dyes are used,but they lose color faster with frequent washings. Semi-permanentdyes are generally safe and can be used at home. Because theydon’t contain bleach, they can’t lighten hair, but they can darken graying hair.
If you decide you’re unhappy with your new semi-permanent color,many home ingredients can help you rinse out the dye. Commonhair rinse ingredients found around the house include tea, beer(which is also thought to add body to the hair and make it moremanageable), lemon juice, and heavily diluted honey (50 drops in a pint of water). Rinse with any of these remedies after washing your hair if you want the dye out faster. The sooner you wash out the dye, the quicker it will come out.
Permanent Hair coloring
Permanent hair coloring can be applied to the whole head or justin select areas for streaks or highlights. Before hair can be permanently dyed, all the existing color has to be removed by a strong hydrogen peroxide (in a concentration of 30 to 40 percent) that bleaches out all the melanin granules. This may produce some permanent damage to the keratin in the hair cortex, leaving the hair with a lifeless look.
Ammonia is the alkaline chemical applied to open the cuticle and allow the hair color to penetrate the cortex of the hair. It also acts as a catalyst (accelerating the chemical reaction) when the permanent hair color comes together with the peroxide.
Various alcohols and conditioners may also be present in permanent hair color. The conditioners close the scales on the cuticle after coloring in order to seal the new color to the cortex. Closing the scales of the cuticle is important to maintain the moisture of the hair cortex.