Paper in strings
Production
Strips of paper are threaded between several strings. The paper is placed in the lower half of the strings so that the strings can be played in a regular way.

Paper in strings.
Sticky paper, like aluminum foil for example, can be wrapped around single strings.

Aluminum foil around a string.
Sound
The sound of a harp prepared with paper has often been called the snare-drum effect. Although the sound is not really like a snare-drum, it may be reminiscent of it. The result is a short accented sound with a slight buzz.
The sound varies greatly according to the type of paper threaded in the strings. There are many possibilities. For example:
Notation
The prepared area should be clearly identified. It takes a few seconds to prepare the strings. The preparation can, however, be removed quickly.

Example of how to indicate prepared areas.
Range
The whole harp.