The Colors of the Liturgy
Purple, or violet, is the color of penance, preparation, and sacrifice. This is the color worn during Advent and Lent, penitential seasons preparing us for great feasts (yes, Advent is still considered a penitential season but isn’t taken to the degree that Lent is). This is why I wear purple on All Souls’ Day; it indicates the penance and preparation that is Purgatory (the souls for whom we pray on that day) leading to the feast of Heaven. I think it parallels the idea of Lent and Easter. I also wear purple for funerals because I don’t think white vestments reflect well the celebration taking place. There is sorrow, not joy, at the death of a loved one. This sorrow is still filled with hope, which is why I don’t like using black vestments for funerals, either. Purple expresses the mix of sorrow and hope. A purple stole is worn by the priest in the sacrament of penance.
Rose vestments are worn (rose—not pink—“Jesus rose from the dead, He didn’t pink from the dead!” as the popular adage goes. The rose vestments are a sign of rejoicing even in the midst of penance). Rose vestments are worn on the 3rd Sunday of Advent and the 4th Sunday of Lent, about the midway point of both seasons.
Red is the color of the Passion (cf., blood), of martyrs (same bloody reason), and of the Holy Spirit (calling to mind fire). Red is used on days that those things are celebrated, e.g., Palm Sunday, Good Friday, Pentecost, Confirmation, feast days of martyrs.
Green is the color of hope and life. It is used for Sundays in Ordinary Time that are not other feast days and weekdays in Ordinary Time when there is no other feast day. These weekdays in Ordinary Time are sometimes called “ferias” for ferial days.
White is the color of joy and purity. It used for the Easter Season, the Christmas Season, Feasts of the Lord—other than His Passion, Mary, saints who are not martyrs, and other joyous occasions.
Gold or Silver vestments may be used for great celebrations or solemnities to replace green, red, or white.
Black vestments, representing death and mourning, can be worn on All Soul’s day and for funerals. I do not wear black vestments as a general rule. I think other colors—especially purple—better represent what is being celebrated at those Masses.
Blue is not a Latin Catholic liturgical color in and of itself (except for a few places in Spain that have special permission to use it). It can be used as decoration on another color but is not to be the main color of vestments. There was a push a couple of decades ago for blue vestments in Advent. The argument was that it causes us to reflect on Mary in the Advent season. The use of blue vestments is not permitted, so the trend became to use the bluer shades of purple during Advent (for Mary) and the redder shades in lent (for Jesus’ blood). I tend to do this. However, in Rome they do the opposite; the bluer are seen as more somber and are used in Lent while the redder shades are seen as more festive and are used in Advent.