DIN ISO 14502-1 : 2007 Title: Determination of substances characteristic of green and black tea - Part 1: Content of total polyphenols in tea - Colorimetric method using Folin-Ciocalteu reagent (ISO 14502-1:2005 + Corrigendum 1:2006) Year: 2007 Publisher: DIN Media GmbH Availability: Within 1-2 working days