 This colour is often referred to as "Sarum blue".The Lutheran Book of Worship lists blue as the preferred colour for Advent while the Methodist Book of Worship and the Presbyterian Book of Common Worship identify purple or blue as appropriate for Advent.There has been an increasing trend in Protestant churches to supplant purple with blue during Advent as it is a hopeful season of preparation that anticipates both Bethlehem and the consummation of history in the Second Coming of Jesus Christ.