Re: tech stuff
Posted by Pierre on April 20, 2004 at 20:53:56:
In reply to: Re: tech stuff posted by Fia on April 20, 2004 at 06:57:57:
: The ammonia/perioxide combination actually breaks down part of the: keratin/protein in the hair each time you color your hair.
From the website: "The larger the volume of the developer, the greater the amount
of sulfur is removed from the hair." Sulfur cross-links proteins. There are two amino
acids which have sulfur in them, cysteine and methionine, and when two cysteines
come together with their -SH groups touching, they form a cross-link. If you delete
these cross-links, the hair falls apart.
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