Much of Portuguese architecture is adorned with traditional hand painted tiles. A practice that was introduced by the Muslim influence on the culture centuries ago and is still a vibrant element on many facades. One of the oldest tile manufacturers in Portugal is the Fábrica Sant'Anna, which has produced handmade tiles since 1741. To this day, they still turn out beautiful tiles adorned with the traditional saturated greyish blue, which only becomes more intense when the tiles are fired in the kiln. This color pays homage to this ancient Portuguese practice.