Tannins exist naturally in a wide range of plants as a Bitter Polyphenolic Compound often as an anti-predatory protection constituent and takes its name from the Old High German word "Tanna" meaning Oak or Fir Tree. Various Superstitions, Rumours, Theories and some undeniable Facts surround the mystery as to why Tannins favourably enhance the ageing effect in wines but suffice it to say that this little pot does what it says on the tin and adds Tannin . . . . which of course, makes your wine taste Gracefully Mature when added at the right time in the right measure.