brazilian keratine formula

good morning 
i want to ask you if any one have an idea about how can we add the formaldehyde in a solution of prepared keratine mix at the end and which percentage can i use. because i have already prepared mixes and i want to add formaldehyde to it.
thank you

Comments

  • In my country I don't think it is legal to use formaldehyde. It is a known carcinogen.
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  • ... and formaldehyde-free formulations don't work nearly as well.
  • PerryPerry Administrator, Professional Chemist
    That's why using a formaldehyde donor like DMDM Hydantoin, Imidazolidinyl Urea, or Diazolidinyl Urea can work.
  • Perry said:
    That's why using a formaldehyde donor like DMDM Hydantoin, Imidazolidinyl Urea, or Diazolidinyl Urea can work.
    Do formaldehyde donors pass regulations for free formaldehyde (after being left standing for a while so enough formaldehyde has been released)?

  • in my country is legal to add a little quantity of formaldehyde in the keratin formula
  • It's legal at 0.1% as a preservative, not as an active ingredient. 
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