That's cool mate.. The pipe has to be titanium to get the bluish colouring, when you heat the pipe it will start to go a straw colour and then move thought to light blue, darker blue, purple and eventually it will start to go back to a straw colour if heated to far.. As far as the colour fading or discolouring, it will most likely happen if the pipe gets super hot near the head or you get a build up of mud on the pipe but you can clean the pipe up with a some green scour pads and perform the heat treat process again.