火山灰[kazanbai] volcanic ash
灰になる[haininaru] to be reduced to ashes
灰の水曜日[hainosuiyoubi] Ash Wednesday
灰押さえ[haiosae] ash leveler (use in a brazier)
灰押し[haioshi] ash leveler (use in a brazier)

灰殻[haigara] ashes
灰均し[hainarashi] ash leveler
灰皿[haizara] ashtray
灰受け[haiuke] ash pan

茜色[akaneiro] madder red
暗褐色[ankasshoku] dark brown
暗色[anshoku] dark colour
暗赤色[ansekishoku] dark red
異色[ishoku] singular (esp. artist, artwork)

からすの濡れ羽色[karasunonurebairo] glossy black (hair)
烏羽色[karasubairo] glossy black
炎色[enshoku] flame (color, colour)
鉛色[namariiro] lead colour
鴬色[uguisuiro] greenish brown

藻掻く[mogaku] to struggle
海藻[kaisou] seaweed
褐藻[kassou] brown algae
珪藻[keisou] diatom
珪藻土[keisoudo] diatomaceous soil

紅藻[kousou] red algae
才藻[saisou] poetic talent
稚海藻[wakame] wakame (species of edible brown seaweed, Undaria pinnatifida)
藻草[mogusa] water-plants