<P> Over the centuries, various criteria were laid down for wine to be appropriate for use in the Eucharist . Editions of the Tridentine Roman Missal had a section De Defectibus on defects which could occur in the celebration of Mass, including defects of the wine . Canon 924 of the present Code of Canon Law (1983) states: </P> <P> § 1 The most holy Sacrifice of the Eucharist must be celebrated in bread, and in wine to which a small quantity of water is to be added . </P> <P> § 2 The bread must be wheaten only, and recently made, so that there is no danger of corruption . </P> <P> This means that the wine must be naturally fermented with nothing added to it, and the wine itself cannot have soured or become vinegar, nor can it have anything artificial added to it (preservatives, flavours). Wines are made from Vitis vinifera grapes . While the Catholic Church generally adheres to the rule that all wine for sacramental use must be pure grape wine and alcoholic, it is accepted that there are some circumstances, where the priest is an alcoholic for example, where it may be necessary to use a wine that is only minimally fermented, called mustum . </P>

What kind of wine do churches use for communion