Well, technically speaking wood creosote is yellowish to clear. But practically speaking it is dark brown or black the way we produce it in improperly vented smokers, or by air-tight wood burning stoves.
It looks like a glossy black coating.
Jim - Another transplanted Texan
Former KCBS CBJ
Large and Medium Big Green Eggs , Black 18.5" WSM, Blue Weber Performer - Stainless, Green Weber OTG Kettle , Brinkmann SnP Pro, and a Stainless UDS. One retired Portable Kitchen grill.
Red Thermapen, Maverick ET-732, EdgePro Apex Sharpener.
Avatar is the original 1951 Weber Kettle