No.Tea contains polyphenols (aka catechins), which are a
specific type of tannin. Green Tea contains more of these
substances (30-42% of the extractable solids) than Black Tea or
Oolong Tea. Oolong Tea has 8-20% catechin content, and Black Tea is
about halfway between Green Tea and Oolong Tea in catechin content.
Tea does not contain Tannic Acid. See articles "Green tea
composition, consumption, and polyphenol chemistry" at PubMed
(National Center for Biotechnology Information); and "The Chemistry
of Tea" at HerbalGram (American Botanical Council). Click Related
Links below to view these articles.