Wild woad The ancient method of making ciqing paper was extremely difficult. It involved extracting dye from the stem and leaves of indigo-bearing plants, and using it to stain the paper.
上山採馬藍古代磁青紙的製作極為不易，是從「藍」這種植物的莖葉提煉製「靛」，或稱「澱」，再染於紙上。