Much better result this time, still a few "browns" but not nearly as many as the first time.
Just the same as the first time, except that this time I let it burn for longer
This was taken half an hour after lighting. When the wood gas caught fire this time I let it continue.
Fifty minutes later its still blazing away. I let it finish off before closing down.
Meanwhile, I made a tiny fire with the charcoal from the first burn and boiled up some water for a cup of tea.
When I went back a couple of days later the results were much better!
Meanwhile I've been constructing a retort from an old gas bottle within an oil drum. More about this on another post.