What do the couple's names "black dyed green Yi Yan" and "cold tears dyed green Tsing Yi" mean? thank you

In ancient times, cyan meant black, so Tsing Yi was also a black dress, dyed with black ink, which means that black ink was dyed into the color of clothes. As a screen name, it embodies the artistic conception of a figure of speech ... The sentence "Cold tears stain Tsing Yi" means to lower your head and whisper goodbye, and tears wet the blue dress.