The quality of plating is defined by specifications. At equal specifications, the quality of a plated flute will be exactly the same as a that of a plated water-block. The cost of plating a musical instrument will be much higher simply because of the much larger surface area to plate.
Frankly, I don't know if manufacturers of musical instruments publish their plating specifications. After all, musicians might not be as interested in the manufacturing process as they are in the musical characteristics of their instrument. Conversely, our audience is composed of engineers and technically oriented people who need industry standard references (ASTM, MilSpec) to evaluate our manufacturing quality standards.
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