Handkerchiefs were women's jewel-like boudoir in ancient times, usually folded into concentric circles and stuffed in armbands. Handkerchiefs are intimate and warm, so ancient women became Jin Lan's sworn sisters, also known as "friends". Putting a ring on one corner of the handkerchief and other triangles passing through it is called "wearing the heart", which may contain the daughter's heart. A Dream of Red Mansions wrote the legacy of infatuated daughter Xiaohong in the 24th chapter, which made her homesick and finally made a love affair. This small square towel conveys many emotions in the silent female world for thousands of years. The blue shirt is easy to get wet, and the red yarn is full of tears. Li Yidu wrote in the poem "Book Red Yarn Handkerchief" in the Tang Dynasty: The bag is really fragrant, but who sees it as a thief, tears turn red. Diligence leaves a relaxed heart so that you can be in the arms of your lover.

However, there is also a name-slough, which is a one-foot square plain silk handkerchief. In ancient poetry, slough, the yarn woven by mermaid, is often used to represent a handkerchief to wipe tears. "Spring is as old as ever, people are empty, and tears are red." "It's not sad to send a large-scale gift!" The ancients also used to express their feelings in poetry, which was called "geometry". Gradually, "geometer" became synonymous with letters between lovers. "The ruler is like a remnant of snow, forming a pair of carp."