Here’s a very interesting article by Chuck Stanion dated January 13, 2023:
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Grain is made up not only of capillaries but of growth rings. Most noticeable on sandblasted pipes, though discernible on smooth pipes with excellent grain as well, growth rings may be envisioned by imagining the spherical burl. As years go by, the sphere grows in annual layers that sheath the root ball, layer after layer, outward from the center and bisecting the capillaries at nearly right angles.
How Pipes Get Their Grain | A Closer Look at the Heath Tree Burl
Learn more about the grain of the heath tree burl and how it affects the look of briar pipes.www.smokingpipes.com
It has been my experience that a piece of briar with extremely close together growth rings, is the most reliable indicator of smoking quality.
Beautiful grain figure sells pipes.
Denser briar smokes better.
You can have dense briar with growth rings only a razor blade width apart on a stunningly grained piece of briar.
But in my experience the two are usually not compatable. A dense piece of briar is usually plain and a fancy one is not as dense.
BL - How does this relate to your marshmallow briar hypothesis? Can it be both porous and dense? I wonder how ironwood smokes? I wonder if there will ever be a theoretical way one could exceed the speed of light.