Oig1
0-4
Black (7.5YR2/0) unrubbed and rubbed, fibric materials (burnt) about 70% fiber; most remain consisting of roots; many charcoal fragments (irreversible drying); fine subangular blocky structure; hard, nonsticky and nonplastic; not react with a-dipyridyl and bentizine; sodium pyrophosphate test paper is pinkish gray to pink (7.5YR7/2-4); extremely acid (field pH 4.0).