Before Indigo was used, "woad" (Isatis tinctoria) was used. "Woad is an old color. A conversation with history. A natural dye. An ugly plant. Locked in green leaves, compounds that break into pigments of blue.
Woad pigment- a famous natural dye and source of natural indigo dye, used for several thousand years in Europe and the Middle East. Woad dye extraction produces natural indigo dye from the dark blue-green, spinach-like woad leaves.
Shibori1e. On the image, above, you’ll see circular forms. This is a broken shippo tsunagi or interlocking circle pattern. The lightly dyed segments of the circles are the result of a piece of paper being stitched into the cloth before dyeing. Somehow it helps soften the absorption of the indigo dye and creates a light tone as we can see here.
IndigoVat / Yoshiko also gave an interesting tip during the workshop for oxidising and dyeing the fabric evenly. She suggests stomping or pressing the dyed fabric under layers of newspaper! This is to remove the excess indigo dye caught in the fibres and ensure that all loose indigo particles are removed before the next dip.