As regards the restrictions and requirements pertaining to the use of certain substances authorized for oenological purposes, the following paragraph is added to Article 8 of Regulation (EC) No. 1622/2000: "Tartaric acid, the use of which is provided for in Annex IV(1)(l) and (m) and Annex IV(3)(k) and (l) to Regulation (EC) No. 1493/1999, also called L-tartaric acid, must be of agricultural origin and extracted specifically from wine products. It must also comply with the purity criteria laid d