Does cola contain Tannin

Yes, it does. The info found there: Fundamentals of Pharmacognosy and Phytotherapy by Michael Heinrich, Joanne Barnes, Simon Gibbons, Elizabeth M. Williamson google.com/books?id=BEV_6SGtZJIC&pg=PA240&lpg=PA240&dq=tannin+in+cola&source=web&ots=pgCf8fmpgI&sig=qHKO_9w4KlgwJlb43CftF5k5e40&hl=en&sa=X&oi=book_result&resnum=5&ct=result">http://books.google.com/books?id=BEV_6SGtZJIC&pg=PA240&lpg=PA240&dq=tannin+in+cola&source=web&ots=pgCf8fmpgI&sig=qHKO_9w4KlgwJlb43CftF5k5e40&hl=en&sa=X&oi=book_result&resnum=5&ct=result"]Fundamentals of Pharmacognosy and Phytotherapy