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Catholic AnswerFor the feast of saints who are not martyrs, white is used. For martyrs red.White.
I am answering this question during the Christmas season, so the vestments are white. Here is the entire year: Advent - violet Christmas - white Ordinary Time - green Lent - violet Easter - white Ordinary Time - green If it is a feast day, then the vestments change depending on the feast day. For martyrs, the Holy Spirit, and the passion of Our Lord, the color is red. For saints who are not martyrs, the color is white. For a funeral the priest may use black, white, or violet. Gold may be substituted for any color.
The priest would wear white vestments on the feast day of Saint Catherine of Siena, which is celebrated on April 29th. White is the liturgical color used to honor saints and feasts of special importance in the Catholic Church.
Saint Valentine was a martyr, he was beheaded. In the Catholic Church, the color red is is used for the vestments and altar cloths on the feast day of a martyr.
The Ordo states that White is the color for the vestments on All Souls Day, but Black or Violet may be used instead.
On Good Friday and Palm Sunday and on certain Martyr feast days; also on days honoring the Holy Spirit as at Confirmation
Roman Catholic AnswerPriests do not wear red at Easter. They wear red on Good Friday, feasts of the Holy Spirit like Pentecost, and on the feasts of saints who were martyred
As an altar server, I have seen vestments of the colour: -Red -Black -Green -White -Violet -Purple -White with an imgae of Mary on the back
The formal celebration of an apostle is a feast in the Catholic Church, and red vestments are worn as all of them (save St. Thomas) died as martyrs.
The priest wears white vestments on Easter Sunday, and on all Sundays and weekdays of the Easter season. The white vestments signify resurrection and are also used for masses of the dead, saints' feast days, and other feasts of Our Blessed Lord. Gold may always be substituted for white on special feasts like Easter.
In the Catholic Church, red is worn for the feast days of martyrs (signifying blood), including the Apostles (except John), and also on days focused on Jesus' death on the cross (e.g. Palm Sunday and Good Friday), and when the focus is the Holy Spirit (Pentecost Sunday, confirmation masses) signifying the fire of the Holy Spirit. See the Wikipedia page on "Liturgical_colours" for a more complete answer, including the variations for other churches.
The Vestments. Used the week before Easter.