Re: Honey thread - from TBB and bits from old LHC
Reply With QuoteHoney lightening, Sun-In, UV Oxidation and Oxygen bleach
Conventional peroxide is about 1000 stronger than the level of the peroxide most honeys produce. Yet there have been enough reports on these boards, as well as in the Honey threads, past and current (this one), to confirm that honey can lighten hair colour.
I was curious about why Sun-In works with heat and UV, when both of those things are known to deplete or help decompose hydrogen peroxide. I was asked why honey lightening does not bleach towels or clothing.
This is what I knew.
The exzyme in honey that produces peroxide, is heat and light sensitive. But what if the peroxide is already produced, by letting a treatment sit for 1 hour, in advance of application?
This is what I learned from researching the subjects.
Conventional peroxide has stabilizers added to it, so that it can withstand handling and storage. That would make it less susceptible to decomposition from heat and light.
Honey lightening recipes have no added stabilizers. While honey lightening recipe ingredients naturally contain chelants that protect hair and skin from oxygen free radicals, they are not the same as those required to stabilize conventional peroxide.
Hair needs to be kept very wet with honey lightening to yield the best results based on reports, even when a treatment has been left to sit in advance of application. That may have to do with honey still producing peroxide after 1 hour and the honey lightening boosters also requiring more time to yield their peroxide.
I successfully lightend some freckles on the backs of my hands last year, but I had to keep the skin covered and wet the whole time. I wore plastic gloves for the 1 hour at a time I did the experiments, and had not let the solution sit for 1 hour, in advance of application.
UV accelerates the formation of cell damaging hydroxyl radicals, in conventional peroxide reactions with substances, (UV is damaging to cells on its own. It is not something I recommend to lighten hair or darken skin).
Honey lightening chelants/antioxidants prevent the formation of free radicals, but honey lightening recipe peroxide would be susceptible to breakdown from UV radiation.
Honey lightening works through oxidation. Oxygen bleaches do not lighten clothing or most coloured fabrics. Oxygen bleaches are colour-safe.
“2. What factors contribute to the decomposition of H2O2?
The primary factors contributing to H2O2 decomposition include: increasing temperature …. increasing pH (especially at pH > 6-8); increasing contamination (especially transition metals such as copper, manganese or iron); …. to a lesser degree, exposure to ultraviolet light. ….
4. What are H2O2 stabilizers …. Most commercial grades of H2O2 contain chelants and sequestrants which minimize its decomposition under normal storage …. handling conditions. In some applications (e.g. .... cosmetic formulations) a high degree of stabilization is needed; …. types of stabilizers used in H2O2 …. Colloidal stannate and sodium pyrophosphate …. traditional mainstays …. Other additives may include nitrate …. phosphoric acid.
http://www.h2o2.com/intro/faq.html#2
UV oxidation
“Exposure of hydrogen peroxide to UV light leads to …. scission of the hydrogen peroxide molecule into two hydroxyl radicals.”
http://www.trojanuv.com/en/business/ECTadditionalinfo.aspx
Hydroxyl radicals
“…. can damage virtually all types of macromolecules: carbohydrates, nucleic acids (mutations), lipids (lipid peroxidation) and amino acids (e.g. conversion of Phe to m-Tyrosine and o-Tyrosine). The only means to protect important cellular structures is the use of antioxidants ….”
http://en.wikipedia.org/wiki/Hydroxyl_radical
“Advantages of Powdered Oxygen Bleach
Oxygen bleaches are also color-safe and won't bleach dyed fabrics like chlorine bleach will.”
http://oxygenbleach.homestead.com/files/
“Some non-chlorine bleaches contain slightly weaker oxidizing agents, which will oxidize the colored molecules in many common stains, but not the robust pigments of commercial textile dyes. That's what makes them "color-safe."
http://www.newton.dep.anl.gov/askasc.../chem99533.htm
Originally Posted by Heidi_234
at times like this I wish I gave more thought to my username, instead of typing 234 mindlessly 
cheers
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