From the 2002 General Introduction to the Roman Missal (GIRM) approved for the USA, which can be accessed from
romanrite.com/girm.html :
“346. As to the color of sacred vestments, the traditional usage is to be retained: namely, …
d. Violet or purple is used in Advent and of Lent. It may also be worn in Offices and Masses for the Dead (cf. below). …
f. Rose may be used,
where it is the practice, on Gaudete Sunday (Third Sunday of Advent) and on Laetare Sunday (Fourth Sunday of Lent). …
347. Ritual Masses are celebrated in their proper color, in white, or in a festive color; Masses for Various Needs, on the other hand, are celebrated in the color proper to the day or the season or in violet if they are of a penitential character, for example, no. 31 (in Time of War or Conflict), no. 33 (in Time of Famine), or no. 38 (for the Forgiveness of Sins); Votive Masses are celebrated in the color suited to the Mass itself or even in the color proper to the day or the season.”
For the Ritual Mass of the Scrutinies, I think the 2002 Roman Missal has rubrics directing (or at least suggesting) that violet vestments be used. It has:
“2. IN SCRUTINIIS PERAGENDIS
Hae Missae adhiberi possunt cum colore violaceo quando scrutinia pro catechumenis …”
(Missale Romanum, Libreria Editrice Vaticana, 2002, ISBN: 8820972719, page 973)
There are no such rubrics in the translation of the 1975 MIssale Romanum. (Roman Missal, Catholic Book Publishing Co., New York, 1985, page 826.)