Dear Rosa:

Quoting from a website on this subject:

The Virgin Mary, or Madonna is portrayed in a variety of recurring symbolic themes throughout religious documents in the Middle Ages.The color of her robes is symbolic. Mary is shown wearing a dark blue mantle starting around 500 A.D. This blue is Byzantine in origin and is considered the color of an empress. Blue is also indicative of sapphires and the skies. Red was also a popular color to represent Mary beginning in the 10^th century and by the 14^th century she was often portrayed wearing a red mantle instead of a blue one. The color red is symbolic of nobility, suffering and passion.The classical representation of Mary is with a red robe and a blue mantle.

St. Denis in 1140 created a color of blue never seen before. Within a few decades blue became a common color for the Virgin Mary and also a color of royalty.

The color blue in the first few centuries was considered evil. For several centuries there was much debate and controvesy over color in Church depictions. In some areas no color at all was used in the Church buildings. Eventually it color was considered to have divine symbolism and began to be used. The first time Mary was depicted with a blue mantle was probably around A.D. 500, as mentioned above.

God Bless,
Bro. Ignatius Mary