Instrument wall material barely affects the tone a player hears

Evidence

The debate and misinformation about materials and wind instruments has been going on a long time. The effect of material on the timbre of a flute cannot be zero, but it is almost certainly undetectable by the ear. Trumpets were tested before and after cryo-treatment with sophisticated impedance measurements; no difference could be found. — Eric J. Heller, Why You Hear What You Hear- An…, 1584

Categorization

• XREF: Mirrors the myth-busting that gold/silver cables and audiophile placebo effects get in hi-fi audio communities.
• CANDY: Gold flutes and cryo-treated trumpets are marketed on tone benefits that impedance measurements show are inaudible — a fun anti-snobbery fact for musicians.