ripensandoci meglio le no-lye possono essere di diverso tipo e in questo caso utilizza l'idrossido di litio che è più leggero rispetto alla soda caustica, forse sarebbe meglio lasciare no lye visto che dopo segue idrossido di litio

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Note added at 1 ora (2011-06-07 17:38:31 GMT)
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in sintesi sono
a base di un agente alcalino più leggero della soda acustica, in questo caso l'idrossido di litio oppure ad esempio l'idrossido di guanidina

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Note added at 1 ora (2011-06-07 17:39:08 GMT)
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scusami soda caustica

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Note added at 1 ora (2011-06-07 18:17:25 GMT)
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Ecco qui viene spiegato dettagliatamente quanto detto prima.
"No lye" relaxers
Due to increasing awareness concerning the potential dangers of sodium hydroxide found in traditional relaxer formulas, many women have begun abandoning them.[1] "No-lye" relaxers have become the preferred formula for those unwilling to give up relaxers completely. "No-lye" relaxers are of three main types. One type operates on the same general principle as lye relaxers but uses a slightly weaker alkaline agent, such as potassium hydroxide, lithium hydroxide, or guanidine hydroxide. The last of these is not pre-formulated, but rather is generated at the time of use by combining a cream containing calcium hydroxide (slaked lime) with an "activating solution" of guanidine carbonate.
Another type of "no-lye" relaxer uses ammonium thioglycolate, which is also known as perm salt for its use in permanent waves. Perm salt is a chemical reducing agent which selectively weakens the hair's cystine bonds instead of disrupting the entire protein, but strips out the natural oils even more thoroughly than the alkali hydroxide products. Afterward, the thioglycolate must be oxidized with a special solution of hydrogen peroxide or sodium bromate.
Lastly, in most relaxers sold for home use, the active agents are ammonium sulfite and ammonium bisulfite (the two compounds are interchangeable, depending on the surrounding pH). These also selectively reduce the cystine bonds, but are much weaker and work more slowly. Nevertheless, their mild action minimizes (but does not entirely eliminate) collateral irritation to the skin.
http://en.wikipedia.org/wiki/Relaxer