煙子 / 烟子えんしpigment
出典の根拠 Tobunken's 彩色DB records 煙子/烟子 (lamp black / soot) counted by sheet in Nara-period documents.
関係 Soot black is a pigment relative of 墨色; period records count it as enshi, distinct from the sumi ink stick.
注意 Lamp-black pigment context only. It is documentary attestation, not a measured value for 墨色.
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