Hangaia he putanga matatini ake o tenei rerenga Ko te whakarewa ka tangohia mai i ona kohuke kohuke matua ma te mahinga Kroll, te mahinga Hunter ranei.
Ae ra, ko te putanga matatini ake o te rerenga korero ko "Ko te konganuku ka tangohia mai i ona kohuke kohuke matua ma te mahinga Kroll me Hunter. Ko te pūhui tino noa, ko te titanium dioxide, he photocatalyst rongonui, ka whakamahia i roto i te hanga o nga tae ma. "