My "favorite" natural material is stag for variety of color, texture, and long-term durability.
Second choice is wood because of the variety of color and reflectivity in grains of different species. And when it is stabilized it competes with stag for durability.
Glad to see the images in both threads.
Larry
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Larry W. Williams RKCC #CM-041 ABKA #046 RKS #1246