According to Catholicism, does the usage of Welch’s Grape Juice constitute valid matter for the consecration of the Eucharist at a Catholic Mass?
Some priests who are alcoholics may obtain a dispensation to use Mustum at Mass.
The question of the validity of the use of “mustum,” or grape juice, for priests suffering from alcoholism or for some other medical reason was finally resolved by the Congregation for the Doctrine of the Faith in 1994 in a letter signed by then Cardinal Joseph Ratzinger. Among other things this letter stated:
“A. The preferred solution continues to be communion ‘per intinctionem,’ or in concelebration under the species of bread alone.
“B. Nevertheless, the permission to use ‘mustum’ can be granted by ordinaries to priests affected by alcoholism or other conditions which prevent the ingestion of even the smallest quantity of alcohol, after presentation of a medical certificate.
“C. By ‘mustum’ is understood fresh juice from grapes or juice preserved by suspending its fermentation (by means of freezing or other methods which do not alter its nature).
“D. In general, those who have received permission to use ‘mustum’ are prohibited from presiding at concelebrated Masses. There may be some exceptions however: in the case of a bishop or superior general; or, with prior approval of the ordinary, at the celebration of the anniversary of priestly ordination or other similar occasions. In these cases the one who presides is to communicate under both the species of bread and that of ‘mustum,’ while for the other concelebrants a chalice shall be provided in which normal wine is to be consecrated.” - Use of Mustum at Mass
Here is an interesting note on the subject of Welch’s Grape Juice and the Eucharist in the Methodist Church.
The method of pasteurizing grape juice to halt the fermentation has been attributed to a British–American physician and dentist, Thomas Bramwell Welch (1825–1903) in 1869. Welch was an adherent to the Wesleyan Methodist Connexion which strongly opposed "manufacturing, buying, selling, or using intoxicating liquors" and advocated the use of unfermented grape juice instead of wine for administering the sacrament of the Eucharist, or communion, during the church service. A few years earlier, Welch had relocated to Vineland, New Jersey, a town started in 1861 by Philadelphia land developer Charles K. Landis (1833–1900) to create his own alcohol-free utopian society, a "Temperance Town" based on agriculture and progressive thinking. Landis declared that he was "about to build a city, and an agricultural and fruit-growing colony around it." The population reached 5,500 by 1865. Landis determined the potential in growing grapes and named the settlement "Vineland", and advertised to attract Italian grape growers to Vineland, offering 20 acres (81,000 m2) of land that had to be cleared and used to grow grapes. Welch had moved to the region following his sister who was one of Vineland's earliest residents and began to produce an "unfermented wine" (grape juice) from locally grown grapes that was marketed as "Dr. Welch's Unfermented Wine". This product became "Welch's Grape Juice" in 1893 when Welch and his son Charles E. Welch (also a practicing dentist) had decided to incorporate in 1893 as the Welch's Grape Juice Company at Westfield, New York. - History of Welch's Grape Juice
The reason I wish to bring this up is that I have come across priests using Welch’s Grape 🍇 Juice at Mass. The chalice was subsequently offered to the faithful present.
Has the Catholic Church pronounced on such a scenario as being valid or not?