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Diffuse materials, semi-annular materials tend to be obvious. The growth wheel is slightly obvious. Heartwood reddish brown to purple reddish brown; wood dust leaching solution red. The tube hole is visible under the naked eye and contains red gum; the diameter of the chord is at most 172 μm, with an average of 139 μm; the number is very small to slightly less, 2 to 6/mm2. The axial thin-walled tissue is obvious under the magnifying glass, and the main concentric or slightly wavy thin line (2 to 3 cells wide, more outside the growth wheel). The wood fiber is thick and full of red gum. The wood ray is visible under the magnifying glass; the wavy marks are visible; the ray tissue is in the same shape as a single column. Aroma; fine structure; texture staggered; air dry density O. 94 to 1.01 g/cm3.
B2 Andaman Red Sandalwood Pterocarpus dalbergioides Benth.
Diffuse materials, semi-annular materials tend to be obvious. The growth wheel is quite obvious. Heartwood reddish brown to purple reddish brown, often with black stripes; scratches visible; water leaching liquid yellow-brown, fluorescent. The tube hole is inside the growth wheel, which is quite obvious under the naked eye. The diameter of the chord is 310μm at the maximum, with an average of 149μm; the number is at least 2~5/mm2. The axial thin-walled tissue is obvious under the magnifying glass, and the main concentric thin-line and intermittent poly-wing (mostly 2 to 3 cells wide, more outside the growth wheel). Wood fiber walls are thin to thick. The wood ray is visible under the magnifying glass; the wave marks are slightly seen under the magnifying glass; the ray tissue is in the same shape as a single column, the aroma is not or very weak; the structure is fine; the texture is usually staggered, the deer pattern; the air dry density O. 69 to 0.87 g/cm3.
B3 Litchi rosewood Pterocarpus ennaceus Poir.
Diffuse materials, semi-annular materials tend to be obvious. The growth wheel is slightly obvious or obvious. Heartwood purple reddish brown or reddish brown, often with dark stripes; scratches visible. The tube hole is inside the growth wheel and visible under the naked eye; the chord diameter is 290 μm maximum, with an average of 177 anus m; the number is very small to slightly less, 2 to 7/mm2. The axial thin-walled tissue is rich and visible or visible under the magnifying glass, and the main band is thin and thin (mostly 2 to 4 cells wide). Wood fiber walls are thin to thick. The wood ray is obvious under the magnifying glass; the wave marks are visible; the ray tissue is in the same shape as a single column. Aroma is not or very weak; fine structure; texture staggered; air dry density O. 85 g/cm3.
B4 Indian rosewood Pterocarpus indicus Willd.
Semi-annular or loose-pore material. The growth wheel is obvious. Heartwood reddish brown, deep reddish brown or golden yellow, often with dark and dark stripes; scratches are not seen; water leaching solution is dark yellowish brown, with fluorescence. The tube hole is inside the growth wheel, which is quite obvious under the naked eye. The diameter of the chord is 258μm at the maximum, with an average of 141μm; the number is very small to slightly less, 1~12/mm2; often contains yellow sediment. The axial thin-walled tissue is rich, and it is obvious under the magnifying glass. The main concentric layer of the fistula is narrow-banded, poly-winged and thin-lined (1 to 4 cells wide). Wood fiber walls are thin to thick. The wood ray is visible under the magnifying glass; the wavy marks are evident under the magnifying glass; the ray tissue is in the same shape as a single column. The new cut surface has aroma or very weak; the structure is fine; the texture is obliquely staggered, with the famous Amboyna tree bag (tumor) pattern; air dry density O. 53～O. 94 g/cm3. The color and weight of such strains vary greatly.
B5 large fruit rosewood Pterocarpus macarocarpus Kurz
Diffuse materials, semi-annular materials tend to be obvious. The growth wheel is quite obvious. Heartwood orange red, brick red or purple red, often with dark stripes; scratches visible to obvious; wood dust leaching liquid light yellow brown, weak or no fluorescence. The tube hole is larger inside the growth wheel (but the proportion of the growth wheel is smaller than other species), visible under the naked eye; the chord diameter is the largest at 269 anal m, with an average of 1 27 pm; the number is very small to slightly less, 1 to 1 5 / mm2, often containing yellow deposits. The axial thin-walled tissue is obvious under the naked eye, and the main concentric layer of the fistula is band-shaped/poly-winged and thin-lined (1 to 4 cells wide). Wood fiber wall thickness. The wood ray is visible under the magnifying glass; the wavy marks are slightly obvious or obvious under the magnifying glass; the ray tissue is in the same shape as a single column. Rich aroma; fine structure; texture staggered; air dry density 0.80 ~ O. 86 g/cm3.
B6 Cystic rosewood Pterocarpus marsuptum Roxb
Diffuse materials, semi-annular materials tend to be obvious. The growth wheel is quite obvious. Heartwood golden brown or light yellow purple reddish brown, often with dark stripes; scratches are not seen; sawdust water leaching solution reddish brown, fluorescent. The tube hole is larger inside the growth wheel (but the proportion of the growth wheel is smaller), which is visible under the naked eye; the chord diameter is at most 344 μm, with an average of 1 74 μm; the number is small, 3 to 5/mm2. The axial thin-walled tissue is obvious under the naked eye, and the main concentric layer of the fistula is strip-shaped and thin-lined (widely 2 to 3 cells). The wood fiber wall is slightly thick and has a diameter of up to 20 μm. The wood ray is visible under the magnifying glass; the wavy marks are slightly obvious or obvious under the magnifying glass; the ray tissue is in the same shape as a single column (more) and multiple columns (2 columns). Aroma is not or very weak; fine structure, staggered texture; air dry density O. 75～O. 80 g/cm3.
B7 Horsefoot Rosewood Pterocarpus pedatus Pierre
Diffuse materials, semi-annular materials tend to be obvious. The growth wheel is quite obvious. Heartwood reddish brown to purple reddish brown, often with dark stripes; scratches are not seen; sawdust water leaching liquid fluorescence is obvious. The tube hole is larger inside the growth wheel (but the proportion of the growth wheel is smaller), which is quite obvious under the naked eye, containing gum; the diameter of the chord is 284μm maximum, 143μm on average; the number is very small to slightly less, 2~11 /mm2. The axial thin-walled tissue is obvious under the naked eye, and the main concentric layer of the fistula is narrow-banded, poly-winged and thin-lined (1 to 3 cells wide). Wood fiber wall thickness. The wood ray is visible under the magnifying glass; the wave marks are also the same; the ray tissue is in the same shape as a single column. Strong aroma; fine structure; staggered texture; air dry density o.96-1.01 g/cm3.
Table 2 rosewood species and their wood characteristics
Wood structure characteristics of rosewood species
B1 Vietnamese rosewood Pterocarpus cambodianus Pierre