100% cotton 104 x 100cm Colorfast [Tetsukon (Iron Navy) Color] One of Japan's traditional colors, referring to a dark blue with a slightly iron-like (blackish) hue. Defined in JIS standards as "very dark purplish blue." A color obtained by repeatedly indigo dyeing navy blue. [Shantung] A plain weave fabric that uses unevenly thick yarns (raw silk) for the weft, creating a unique ribbed pattern on the surface of the fabric. #furoshiki #ecobag