Only pure sinusoids produce the sensation of a colorless tone.

Evidence

Ohm realized that only the sinusoid waveform yields the sensation of a colorless tone, a pure partial. Any embellishments to this sound taking the waveform away from a pure sinusoid requires higher harmonics (higher partials) to describe. — Eric J. Heller, Why You Hear What You Hear- An…, 2045

Categorization

• DEFINE: Defines the concept of a ‘colorless tone’ / pure partial in terms of waveform shape.