A brush’s hair type does not describe the whole tool. Tokyo’s hand-planted-brush reference explains a construction in which a line secures folded tufts and a thin wooden cover conceals that line.
Technique and structure
The technical sequence begins with marking and drilling the wooden body. A measured amount of hair is folded and planted in a hole using a hiki-sen pulling line; the historical account identifies that line as stainless-steel wire. A thin wooden cover then hides it, and the body and cover are brought to matching dimensions. Preparing the holes, retaining the tufts and closing the back are connected structural operations. The visible bristles alone do not show that hidden construction.
Preparation still matters
Before planting, the process removes short or curled hairs. Later trimming sets the hair length and evens the tips. Those stages explain why asking only whether a brush contains horsehair leaves both preparation and fastening unspecified. This is a construction account, not a comparison test of hand and machine production.
For international readers
Confirm the intended task and cleaning instructions with the maker. No compatibility with delicate textiles, skin or solvents is inferred for an unidentified brush.
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日本語
東京手植ブラシ：木の蓋の下にある引き線
東京都の手植ブラシ資料では、木地に穴をあけ、毛を二つ折りにして引き線で植え、薄い木板の蓋で線を隠します。沿革の説明は引き線をステンレス線としています。短毛・クセ毛の除去や毛丈の調整も別工程です。毛の種類だけでなく、見えない固定構造を確認するための解説です。