Stray Leaves Tea

How bitter the taste of tea is.

A feeling rather than a taste, often described as a drying sensation after drinking. High astringency is often a marker of low quality, however most people like some astringency to remain.

See this article or Wikipedia for more details.

Returning sweetness is a common sensation with Puer tea. It is the lingering sweetness that comes after you have drunk the tea.

See also here and here.