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Official Journal of the Japan Wood Research Society

Table 2 Grade list for wood evaluation

From: Environmental factors and wood qualities of African blackwood, Dalbergia melanoxylon, in Tanzanian Miombo natural forest

Grade

Clear part of surface (%)

Note (visual standard)

3

> 90

Extremely clear, no defects detected in visual inspection

2

60–90

Almost clear but some defects detected

1

30–60

Some serious defects on limited area of surface

0

0–30

Significant serious defects detected on wide area of surface