I have an old upright piano but it is in excellent condition, however the humidity of the room interacts with its tuning and (I found it sharp by almost a quarter tone, and also with some difficulty in the hammers' return) I should preface that in a healthy environment it has never given me problems.
I keep it very far from the wall!
I wanted to know if there are remedies like silicon salts to place inside it to alleviate at least part of the problem and where they can be found. Or if there are other types of systems on the market or DIY solutions!
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BackSpace
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Reply 2 by BackSpace
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In the meantime, you could let it get some air by keeping it open and anyway opening it completely on a regular basis
There are systems specifically made for the piano to keep humidity and temperature under control. It seems to me that there is another post that talked exactly about this topic, try to do a search.
I have already expressed my opinion on the post mentioned by Simone. I do not feel comfortable recommending a dehumidifier as a "cure-all." In fact, while the device absorbs... the instrument also absorbs! With such pronounced damage, I would suggest moving the instrument. As for the irreversible damage to the hammer pins: intervention can only take place after moving it to a drier environment, which is therefore more suitable for stabilizing the absorption of the correct relative humidity. We can talk about it again later, if you wish, since you are in Rome. It is also possible to evaluate conducting an on-site inspection and an examination of the instrument.