真っ黒
まっくろ · makkuro · JLPT N2 · na-adj
pitch black
⚫ 真 (true/pure) + 黒 (black): 'truly black', the intensified form of 黒
真っ is an intensifier prefix meaning 'truly' or 'utterly,' so 真っ黒 is 'utterly black,' like 真っ赤 (deep red) and 真っ白 (pure white).
真 — 匕 (spoon) over 目 (eye) over 八 (eight/base)
真 originally depicted a person or vessel used in ritual, conveying the idea of something genuine or true. Over time the form was reanalyzed as components like 匕, 目, and a base, but the core meaning of 'real, true, genuine' has remained stable since early bronze inscriptions.