You should have noticed what's produced when cellulose and its derivatives burn. After all, you are a scientist and scientists are observant creatures! (But don't worry, we'll let you watch the videos again later.) So let's go study combustion products.
Be Observant: Along the way you should make lists of your observations. (There will be hints too!) Pay attention - there will be questions to answer at the end (of course!).
OK - when you're ready, continue here.