Abin da yake haddasa wannan sauyi ba a fahimce shi sosai har yanzu, inda wani bincike ya nuna cewa gashi yana furfura ne ko rasa launi ta hanya iri daya da yadda ake sauya launin gashi idan mutum yana son ya yi ado ko wani abu na fitar da launin gashinsa, ta amfani da sinadari na kanti(bilichi).
