Why the blackish/brown smoke on start-up

[fespo]

In my smoke dragon when I add wood and all air the vents are open I get a heavy blackish/brown gray smoke until it is going really strong. I using 100% pallet wood, all sizes. I have never seen this something like this before. Is it burning the creosote up? Thanks

 

[begreen]

Might be or perhaps there is a contaminant in the wood. Some pallet wood is treated.

 

[kennyp2339]

Combustion, its all trying to light off at the same time, to rich of an environment, go on youtube and search how to read smoke, its a firefighters training video, but anyone can learn about smoke.

 

[Thislilfishy]

I would say it's treated lumber, or possibly soaked in some sort of petroleum product (like oil or hydraulic fluid).

Ian

 

[fespo]

Wood is clean, no treated no oil. Anything that looks dirty it goes in thrash can