According to Catholicism, does Welch’s Grape Juice constitute valid matter for the consecration of the Mass?

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In the article "Why Grape Wine?", written for the website catholic.com, David Lang quotes from a clarification to the CDF document you mention:

THE CONSEQUENCE OF MATTER

So, how does the Church address the possible problem of alcoholism? Could grape juice from a supermarket shelf be sacramentally adequate? No: A process of maturation or a “time-element” appears necessary from Scripture. After all, Christ came to earth and underwent his Passion in the “fullness of time” (D-R), or the “right time” and “proper time” (RSV), or the “fitting time” (NAB)—see Ecclesiastes 3:1, 8:6; Wisdom 18:14-15; Romans 5:6; Galatians 4:4; 1 Timothy 2:6; Hebrews 1:1-2.The

The prefect [of the Congregation for the Doctrine of the Faith] at the time, Joseph Cardinal Ratzinger, issued a more precise clarification of mustum in a circular letter (June 19, 1995) addressed to presidents of episcopal conferences. He elaborated that for grape juice to qualify as mustum, there must be no interference with its inherent tendency to ferment, even if the actual fermentation process is “arrested at an early stage.” This restriction would, for instance, exclude pasteurization, which entails enzymatic destruction. (So much for supermarket grape juice.)

Thus the priests you saw were not confecting a valid Eucharist, and were possibly committing a sin. (If they had found grape juice bottled straight off the vine they would have been fine.)

Upvote:2

I have come across priests using Welch’s Grape 🍇 Juice at Mass.

That's very clearly an invalid Mass.

Canon law makes it very clear that wine is the necessary matter:

Can. 924 §1. The most holy eucharistic sacrifice must be offered with bread and with wine in which a little water must be mixed.
[…]
§3. The wine must be natural from the fruit of the vine and not spoiled.

See p. 1117 §"Alcoholic Priests" of New Commentary on the Code of Canon Law, which cites St. Thomas Aquinas Summa Theologica III q. 74 a. 5 arg./ad 3:

Objection 3:
Further, just as the clarified wine is drawn from grapes, so also are the juice of unripe grapes and must. But it does not appear that this sacrament may be made from such, according to what we read in the Sixth Council (Trull., Can. 28): "We have learned that in some churches the priests add grapes to the sacrifice of the oblation; and so they dispense both together to the people. Consequently we give order that no priest shall do this in future." And Pope Julius I rebukes some priests "who offer wine pressed from the grape in the sacrament of the Lord's chalice." Consequently, it seems that wine from the grape is not the proper matter of this sacrament.
[…]
Reply to Objection 3:
The juice of unripe grapes is at the stage of incomplete generation, and therefore it has not yet the species of wine: on which account it may not be used for this sacrament. Must, however, has already the species of wine, for its sweetness [*"Aut dulcis musti Vulcano decoquit humorem"; Virgil, Georg. i, 295] indicates fermentation which is "the result of its natural heat" (Meteor. iv); consequently this sacrament can be made from must. Nevertheless entire grapes ought not to be mixed with this sacrament, because then there would be something else besides wine. It is furthermore forbidden to offer must in the chalice, as soon as it has been squeezed from the grape, since this is unbecoming owing to the impurity of the must. But in case of necessity it may be done: for it is said by the same Pope Julius, in the passage quoted in the argument: "If necessary, let the grape be pressed into the chalice."

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