Here is the quote from [Redemptionis Sacramentum](
http://www.vatican.va/roman_curia/c...0423_redemptionis-sacramentum_en.html#Chapter IV) that pertains to your question:
[103.] The norms of the Roman Missal admit the principle that in cases where Communion is administered under both kinds, “the Blood of the Lord may be received either by drinking from the chalice directly, or by intinction, or by means of a tube or a spoon”.
[191] As regards the administering of Communion to lay members of Christ’s faithful, the Bishops may exclude Communion with the tube or the spoon where this is not the local custom, though the option of administering Communion by intinction always remains. If this modality is employed, however, hosts should be used which are neither too thin nor too small,
and the communicant should receive the Sacrament from the Priest only on the tongue.
[192]
[104.]
The communicant must not be permitted to instinct the host himself in the chalice, nor to receive the instinct host in the hand. As for the host to be used for the intinction, it should be made of valid matter, also consecrated; it is altogether forbidden to use non-consecrated bread or other matter.