An inkstone is part of the preparation for writing. A solid inkstick is rubbed with water on its mildly abrasive surface to make liquid ink for a brush. The tool needs a surface capable of doing that work and a place to hold the resulting liquid. Decoration can surround those functions, but cannot simply replace them.
Benxi’s Liao inkstones bring the appearance of the material into this practical object. Purple and green are familiar colours in descriptions of the local craft. The name connects the object to Liaoning, while modern records place important stone resources and production activity in Benxi’s Nanfen and Pingshan areas.