Synthetic brushes tend to dump too much of the paint bead at the beginning of the brush stroke and leave a larger puddle of paint when the brush is lifted from the paper, and they cannot compete with the pointing of natural sable brushes and are much less durable.
22.
In drawing on the prepared block, care must be taken not to damage the somewhat tender surface of the compressed chalk and the safest instrument with which to apply the glutinous ink is a fine sable brush, but an ordinary pen may be employed if the operation of drawing is performed with caution.
23.
The skill is then honing your technique to be able to actually deliver a strong, inked piece that is just how the artist wanted it to be . " For feathering, Hitch uses a size 0 sable brush, which he says provide a wider range of sensitive marks than synthetic brushes, despite being softer and harder to use.