Spread the gofun paste evenly on the cedar board to dry, gofun.

After removing impurities, the fine gofun is spread evenly over a board made from Japanese cedar and allowed to dry naturally over a period of about 10 days. Once dry, the powder is removed by tapping on the back of the board. This completes the making of gorun powder, a process that takes about 2 months from the initial kaikuruma shell cleaning.