Detailed historical information about the school colors of Dallas Theological Seminary is not available at this time, but the purple and orange colors of Evangelical Theological College were changed to purple and yellow at some point, perhaps when the college became Dallas Theological Seminary in 1936 but certainly by the early 1960s.
An academic hood list published by the Intercollegiate Bureau of Academic Costume (IBAC) in 1948 described Evangelical Theological College as having a hood lined purple with an orange chevron, which reused a hood lining assignment vacated by the Blumer College of Naturopathy in Connecticut when it went defunct in 1923 or 1924. This suggests an IBAC assignment for Evangelical between 1924 and 1936 when the college became Dallas Theological Seminary. A list compiled by Kevin Sheard in Academic Heraldry in America (1962) described the seminary’s hood lining as purple with a yellow chevron; an identical citation for Dallas Theological Seminary can be found in a 1972 IBAC list.