Explanation of the Structure of a Chinese Brush
Tip, Spine and Reservoir : Most standard Chinese Brushes have a defined tip. Shorter hairs form the core, or spine, of this tip. Longer hairs are arrayed to come to a point where the spine ends. Between the spine and the outside, shorter and sometimes softer hairs are used to form a sort of reservoir into which ink will flow, welling up from the Ink Slab. The core and outside will usually be of the same fur type, while the reservoir hairs might be from a different animal. This reservoir is what allows the Brush to hold enough ink for more complex characters, or even for a series of characters without the need to recharge the Brush.