After cutting the pages, Chen experimented with the thickness of the glue: Too little glue, and the book would fall apart. Too much, and it would seep out and blemish the spine. Moreover, if the spine of the book couldn't be pressed flat, its angle wouldn't be pretty.
裁切完成後，還要反覆試驗調整白膠濃度，以免膠裝成書時，太淡會脫膠；太濃又會溢膠弄髒書背，而且無法壓平，角度做不漂亮。