Canon 848

1. The radical sanation of an invalid marriage is its convalidation without the renewal of consent, granted by competent authority and including a dispensation from an impediment, if there

was one, and from the form for the celebration of marriage required by law, it if was not observed, and the retroactivity into

the past of canonical effects. 2. The convalidation occurs at

the moment the favor is granted; it is understood to be retroactive, however, to the moment the marriage was celebrated unless

something else is expressly stated.