I'm pretty much familar with coughing up phlem. I have chronic brochis and I always will. Coughing up was a part of life, especially cause I smoked heavily but since changing over to PV, I only do that in the morning cause of what builds up overnight sleeping and once in a while during the day. With me, it's what I drink and sometimes, what I eat. If I eat pink candy, the phlem will have a pink color--a green mint, same thing, coffee with milk, same thing, cherries, same thing. Otherwise, it's clear or whitish. I gotta periodically go to COPD MD. They always ask about the spitting up and I tell them it'd clesr unless I've eaten or was drinking colored things. When they hear the word clear, they're always happy because clear or whitish color means no lung infection which for me can happen. They do understand the overnight buidup cauase all COPD patients have it.