The Four Treasures of the Study—brush, ink, paper, and inkstone—were indispensable tools for scholars in ancient China. Among these, the production of custom inksticks followed a unique tradition: when a new batch was completed, a portion would be set aside to cater future needs or unexpected demand.

Recently, two century-old Shanghai inkmakers joined forces to present a special exhibition of inkstick collections. Cao Sugong Ink Studio, founded in 1667 during the Kangxi reign, was regarded as the foremost of the ‘Four Great Ink Masters’ of the Qing Dynasty. Its partner, Duoyunxuan, established in Shanghai in 1900, celebrates its 125th anniversary this year. Both brands enjoy high reputations in the industry and are regarded as twin jewels in the art world.

The exhibition features more than 300 pieces, many shown publicly for the first time. These works span from the Kangxi era of the Qing Dynasty up to the 1990s, their clients ranged from Qing officials and early Republican leaders to social dignitaries and literary figures. The inksticks served varied purposes—private use, gifts, commemoration, and even official government use. Visitors and calligraphy enthusiasts praised the exhibition as a breathtaking showcase of exquisite craftsmanship and historical significance.