Iron paste - Kaneko

…The tetsujyo parent is chosen from relatives or suitable women of middle age or older from the village, but in the case of the first tetsujyo at a wedding, the matchmaker often also serves as the tetsujyo parent. The tetsujyo parent gives the tetsujyo child gifts such as tools for applying tetsujyo, and the tetsujyo child serves as a servant during the Bon and New Year holidays, and so on, leading to a lifelong close relationship. In addition, the custom of collecting tetsujyo from seven houses in the neighborhood on the first tetsujyo occasion, known as nanatokogane, was also common. …

*Some of the terminology explanations that mention "tetsujoshi" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…鉄漿親としては親類の者とか，村内の中年以上の適当な女性が選ばれるが，婚礼時の初鉄漿の場合には仲人が兼ねることが多かった。鉄漿親は，鉄漿子に対して鉄漿付け道具などを贈り，一方，鉄漿子は盆正月の義理を務めるなど，生涯にわたり親密な交際がなされた。なお初鉄漿の際に，近所の7軒の家々から鉄漿をもらい集める〈ななとこがね〉の慣習も一般的であった。…

※「鉄漿子」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報