Warabi Starch is a very light-coloured powder made from the roots of Warabi ferns.
The ferns need to be at least 1 or 2 years old before they are harvested.
The roots are ground to a powder, which is then put into a water solution, and filtered. The powder is then dried for 1 ½ months.
Three grades are produced: “ultimate” (the highest grade), “prime” and “medium.”