Can I dye human hair extensions?

Yes indeed you can dye human hair extensions, but it does all depend on what kind they are. Not all extensions get damaged when you die them but some do indeed become damaged you could put conditioner on them, then let them sit and that should make them stronger for a while, then add the dye in!

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http://friendfeed.com/pogodigital/e8984185/why-pay-more-when-this-link-has-uk-cheap-hair