Preparing the Nails
With a nylon-strung classical guitar, the best sound is produced by playing with
the nails. The right-hand nails should be long enough to catch and play the string,
but no longer, because a long nail is an impedance and is more likely to break.
As a guide, when you look at your hand with the palm facing you, you should see
a ridge of nail projecting just above the fingertip and following its contour.
The nails should be shaped with a “diamond dust” or similar nail file, and after
shaping a very fine finishing paper (600 grade or better) may be used to polish
off any rough edges. The result will be a pure tone with no scratch to it.