The Rituale Romanum, Title 8, Chapter 1 gives the general rules for blessings. These are also presented in Weller, vol. 3, pp. 2-5.
Note that n. 2 states:
“Benedictiones sive constitutivae sive invocativae invalidae sunt, si adhibita non fuerit formula ab Ecclesia praescripta.
Both constitutive and invocative blessings are invalid if the form prescribed by the Church is not used.”
Although reserved to the bishop, this blessing may be conferred by a priest who secures the faculty.
If you don’t know the answer, don’t ask the question.
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