Hi sorry if this is a stupid question but I've never seen this happen before. Last year in the summer I bought a green/turquoise coloured peterson churchwarden pipe. I bought it because A) I wanted a churchwarden pipe for a smoother/cooler smoke (I detest tonguebite) and B)I liked the colour of the bowl. I am only an occasional smoker and always let my pipes cool down for a number of days after smoking a bowl or two. Since last year the colour has gradually changed form the lovely green colour to a strange looking brown. I have called the shop I bought it from explaining this, only to be told by the "manager" that this is normal and happens to all pipes. Am I being fobbed off here? It has never happened to any of my other pipes.