My emboldening. 284b suggests that Extraordinary Ministers of Holy Communion who administer the chalice may not consume the Blood of Christ which remains, but should give what remains to the priest or deacon for them to consume.
160. The priest then takes the paten or ciborium and goes to the communicants, who, as a rule, approach in a procession. The faithful are not permitted to take the consecrated Bread or the sacred chalice by themselves and, still less, to hand them from one to another. The faithful communicate either kneeling or standing, as determined by the Conference of Bishops. When they communicate standing, however, it is recommended that they make an appropriate sign of reverence, as determined in the same norms, before receiving the Sacrament.
161. If Communion is given only under the species of bread, the priest raises the host slightly and shows it to each, saying: Corpus Christi (The Body of Christ). The communicant replies: Amen, and receives the Sacrament either on the tongue or, where this is allowed and if the communicant so chooses, in the hand. As soon as the communicant receives the host, he or she consumes it entirely. If, however, Communion is given under both kinds, the rite prescribed in nos. 284-287 is followed.
162. The priest may be assisted in the distribution of Communion by other priests who happen to be present. If such priests are not present and there is a very large number of communicants, the priest may call upon extraordinary ministers to assist him, i.e., duly instituted acolytes or even other faithful who have been deputed for this purpose. In case of necessity, the priest may depute suitable faithful for this single occasion. These ministers should not approach the altar before the priest has received Communion, and they are always to receive from the hands of the priest celebrant the vessel containing either species of the Most Holy Eucharist for distribution to the faithful.
284. When Communion is distributed under both kinds:
a. the chalice is usually administered by a deacon or, when no deacon is present, by a priest, or even by a duly instituted acolyte or another extraordinary minister of Holy Communion, or by a member of the faithful who, in case of necessity, has been entrusted with this duty for a
b. whatever may remain of the Blood of Christ is consumed at the altar by the priest or the deacon or the duly instituted acolyte who ministered the chalice. The same then purifies, wipes, and arranges the sacred vessels in the usual way.
Any of the faithful who wish to receive Holy Communion under the species of bread alone should be granted their wish.
285. For Communion under both kinds the following should be prepared:
a. If Communion from the chalice is carried out by communicants’ drinking directly from the chalice, a chalice of a sufficiently large size or several chalices are prepared. Care should, however, be taken in planning lest beyond what is needed of the Blood of Christ remains to be consumed at the end of the celebration.
b. If Communion is carried out by intinction, the hosts should be neither too thin nor too small, but rather a little thicker than usual, so that after being dipped partly into the Blood of Christ they can still easily be distributed to each communicant.
286. If Communion of the Blood of Christ is carried out by communicants’ drinking from the chalice, each communicant, after receiving the Body of Christ, moves and stands facing the minister of the chalice. The minister says: Sanguis Christi (The Blood of Christ), the communicant responds: Amen, and the minister hands over the chalice, which the communicant raises to his or her mouth. Each communicant drinks a little from the chalice, hands it back to the minister, and then withdraws; the minister wipes the rim of the chalice with the purificator.