Half a croissant, on a plate, with a sign in front of it saying '50c'
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Two phase Nair

the first fluid attaches metal ions to hair the second fluid is thioglycolate that only reacts where there at metal ions
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Nair is a thioglycolate that dissolves sulfide bridges at hair If you use it on sensitive skin though it causes a rash

I think that a version of nair where a first fluid is an emulsion with metal ions like Zn that just attach to hair rather than skin then a second fluid that is catalyzed to be active thioglycolate is possible

if it works then Gilette could have a new product

beanangel, Aug 20 2009

wikipedia thioglycolate http://en.wikipedia.../wiki/Thioglycolate
[beanangel, Aug 20 2009]

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       But the stage show wouldn't be that impressive unless Teller grows some more hair first.
Ian Tindale, Aug 20 2009
  
      
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