[Al_The_Man]

I never found an article on this technique so it was a case of trial and error, Get a scrap piece to practice on first. I used a regular nozzle on the propane torch, it might be worth experimenting with different ones.
I found that always place the item you want to torch vertically if possible and start at the bottom and use brush like strokes fairly quickly in an upward stroke, do not stop in one place as you will get a black spot, if you want to darken an area up afterwards, using quick strokes, waft the torch into and out of the pale spot, it will come with practice. You will get small flames on the surface due to resin burning, so keep this under control. Use the normal precautionary measures you would normally use when using a propane torch as pine is highly inflammable!