Another design technique he tried is known as "watermarking." This technique consists of scraping portions of the skin off a gourd when it's nearly ripe, and then sticking pieces of black paper into the stripped areas, leaving the gourd to dry in the sun. Once the gourd has gone a pale yellow in the sun, the paper is torn away, revealing a pattern of contrasting dark and light areas.
另一種浮現圖案的方式，則是所謂的「浮水印法」，將瓠瓜採收後刮去表皮，立即貼上刻有花紋圖案的黑色紙後，置於日光下曝曬，曬到瓜體泛黃，再將黑色紙撕掉，就會浮現明暗對比明顯的色差線條。