The colours associated with Kihachijo are only part of its making. Tokyo’s craft specification also names the weaving structures and the tool used to insert the weft.
Technique and structure
The reference specifies yarn-dyed plain or twill weave and a hand-thrown shuttle for the weft. Dyeing is by hand immersion, using plant dyes made from kobunagusa, tabunoki or shii, with charcoal or mud listed as mordants. These are separate parts of the specification: a description of the dye materials should not replace an explanation of the weave or shuttle work.
A process description is not a care label
The listed silk materials include raw silk, dupion silk and silk-floss spun yarn, or materials of equivalent quality. That range does not state the composition of every item sold under the regional name.
For international readers
Confirm the particular yarn, weave and care instructions with the maker. No colourfastness guarantee or home-dyeing recipe follows from this reference.
Global shipping and buying
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日本語
本場黄八丈：植物染料と手投げ杼を読む
本場黄八丈の規定は、先染めの平織りまたは綾織りと、緯糸の打込みに使う手投げ杼を示します。手作業の浸染にはコブナグサ・タブノキ・シイ由来の植物染料を用い、媒染剤には木炭または泥土を挙げています。染料の説明と織り方を分け、色落ちや家庭洗濯の保証には広げません。