Yao Kuan-mu explains that the "pores" in imitation leather are made by the use of a chemical solvent called DMF. DMF dissolves easily in water; it thus separates from the leather when placed in water, leaving tiny holes that make optimum pores.
姚關穆解釋，人造皮的「毛細孔」是在皮革合成後，滲入一種俗稱 DMF 的化學溶劑；DMF 易溶於水，放入水中後就從皮革上析離出來，留下一顆顆小空洞，成為絕佳的透氣孔。