No. 6: If keratin treatments claim to be "formaldehyde free," what chemical is used instead? For a keratin treatment to give you shiny, straighter, frizz-free hair for months, Schoon explains that it must contain formalin (formaldehyde) or another aldehyde or a chemical that works in a similar fashion. Common "formaldehyde free" products often contain: glutaraldehyde, biformal (a.k.a. oxalaldehyde -- note the "aldehyde") and ammonium thioglycolate (the same chemical used in perms).
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