The TWSBI 1791 inks is a limited edition series of six colors: Sky Blue, Emerald Green, Royal Purple, Pink, Orange, and Prairie Green. Each color is available individually in a 18mL glass bottle or as a 6-bottle set.

The limited edition nature of the inks comes from TWSBI producing a single large batch of each color. Once all the ink is sold, which TWSBI says isn’t expected to happen any time soon, no more will be produced. However, new colors will be added in the future.

Also available are 70mL bottles of Black, Sapphire Blue, Red, and Blue-Black.

The name 1791 comes from a famous book written in 1791 in China, called “The Dreams of the Red Chamber”. TWSBI picked names for each of these inks in Chinese from this book. In English, the names describe the color of the ink, however, in Chinese, it comes from 6 famous buildings described in this book.