Red rot brass instruments2/13/2023 ![]() When all of these ingredients are combined (copper, zinc, salt, acid, and moisture) the result is that a tiny electric charge is generated. ![]() Brass is an alloy composed of two main metals: copper and zinc. Those salts and acids, together with a little moisture will get to work on the brass. Once inside they will become trapped, and that is when the mischief can begin. This sweat will contain small amounts of electrolytes (salts) and acids, which will find their way into the tiniest chink in the lacquer coating. The biggest enemy to the horn at this point is the perspiration (sweat) from the player’s hands. As soon as there is a hole in the lacquer the outside environment will begin to attack and corrode the brass. Once the lacquer gets even the smallest hole, a process will begin that can only be stopped by removing the lacquer from the instrument. ![]() This is why historically when companies have offered a guarantee on their horns that guarantee has not included the lacquer finish. It can also eventually occur simply through exposure to sunlight, or decomposition of the lacquer through age even a well-cared for instrument will eventually have its finish compromised through normal wear and tear. This can occur when the horn is scratched, if the lacquer gets chipped, or if the horn gets dented. With a lacquered horn it is inevitable that the finish will eventually get damaged. ![]()
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