In the species which show that a difference distinct between the duramen and sapwood the normal color from the duramen is usually darker than that of sapwood, and very frequently contrast is remarkable. This is produced by deposits in the duramen various materials resulting from the process of the growth, is probably increased by chemical oxidation and other changes, which have usually little or not appreciable effect on the mechanical properties of wood. Some experiments on the very resinous specimens of pine of Longleaf, however, indicate an increase in force. It is due to the resin which increases the so dry force.
Such a duramen resin-saturated is called the large lighter. The established structures of the large lighter are almost impermeable with the putrefaction and the termites; however they are very flammable. Sections of old pines of longleaf are often dug, are duplicated in small pieces and sold like lighting for fires. The sections dug thus can really remain a century or more since being cut.
The fir tree soaked with the rough resin and dry is increased also considerably by this fact in the force. Since late wood of a ring of growth is usually darker...
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