Hello Sue, I have a question regarding colored sputum. Since my productive cough started over 8 years ago the color of my sputum has always remained the same, after negative or positive sputum cultures, or even after long term multiple antibiotics, always the same light tan color. I always ask any new doctors (multiple) their opinion, most will respond with no big deal or it is just from the inflammatory process itself, not necessarily evidence of an active infection. Have you been told that any color other than clear is a sign of infection? Thanks Bill