The wood is burned and this preserves the wood by making it resistant to sunlight water and fire.
Burnt pine wood finish.
For a durable burnt wood finish that will last 50 years or more follow these shou sugi ban application tips.
The firmer lines of the grain will leave a texture on the surface.
However other softwoods including pine and fir are also good candidates.
Shou sugi ban 焼杉板 is the art of preserving and finishing wood using fire.
The process is specifically meant for cedar but works on many species of wood such as cypress ash oak maple and of course pine like i used.
Shou sugi ban is a japanese technique that dates back to the 18th century for preserving wood.
You can also use shou sugi ban on pine hemlock maple or oak.