Is it possible to change fiber color for TFO sights?

The color of the fiber insert cannot be changed on the TFO sight set. Although we would like to use colors such as red, orange, etc. these colors are naturally too dark to allow sufficent light from the tritium insert to transmit through the fiber. Alternatively this sight is available with a green fiber front sight and and yellow fiber rear sight. This offers contrast between the front and rear sight while providing excellent performance.