puer is made by post-fermentation. it is dark tea, according to leo. in chinese it is hei cha, which actually means black tea.
another tea people mistaken for fermentation made is oxidation made: it is chinese name hong cha, which means red tea. english people call it black tea. in tea world people use the word fermentation for meaning oxidation. oxidation means the tea leaf juice coming out and change to become some other substances because leaf cells broken in processing.
leo has very good writing about this: https://www.teaguardian.com/what-is-tea/black-tea-nature.html#.UyxAFNzVryc
please read not only first page, read also following pages for more stories.
