IWI Inks series of inks contains 24 colors to represent the 24 Solar Terms that represent the annual changes of seasons and helps guide agricultural activities through observing the position of the sun. March 20th marks the Vernal or Spring Equinox which is the fourth Solar Term. On this day, the length of daylight and night are the same.

 These inks are for wordsmithing, hand lettering, writing, calligraphy, drawing, and art.