The commonly known natural dye substance processing for traditional clothes. such as batik and tenun (woven cloth) is fermentation. The fermentation process can specifically be continued with extraction to produce indigo paste. The process can be done mechanically. https://www.ealisboa.com/quick-buy-Acer-shirasawanum-Green-Snowflake-Weeping-Full-Moon-Japanese-Maple-great-pick/