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Joined: May 2015
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Originally Posted by Jt2nd
Or just keep buying new pianos. How about renting nice pianos for short times and let the dealers sort out the damage. If you told them it would be placed in a hot window ----No maybe you would not mention that . In a way that might help to clarify the position . Think what a smart guy would do , and then pretend you`re that smart guy . Am I being cruel ?


Not only just cruel but shortsighted to think you wouldn’t be liable for damage due to neglect. I find it difficult to believe that anyone who plays the piano would do anything intentional to harm one ..., but surprises happen.

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In reference to your question about what part of sunlight actually causes wood damage, there are two types of damage - fading and thermal damage caused by temperature changes.

The UV component is the component mainly responsible for fading. The fading occurs because the UV photons carry enough energy to ionize molecules in the wood and pigments, leading to color changes when the molecules break and turn into something else.

The lower, IR and visible frequency spectrum, causes only heating, either directly from the IR or secondary to visible light energy being absorbed and re-emitted in the form of IR (IOW heat). Many types of glass will block UV but not IR, unless made for that purpose.

If you can block both the IR and UV, what's left is the visible part of the spectrum, which doesn't contribute much to the heating or fading.

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My piano is next to a window, as it takes up most of the small room it's in. I keep the curtains closed, but where I live, sun damage is unlikely to be a problem for anything or anyone... eek

The damp misery of summer does tend to be a little bit warmer than the damp misery of winter though... grin

Last edited by johnstaf; 05/30/19 02:23 AM.
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Originally Posted by BruceD
Originally Posted by Jt2nd
This might be totally irrelevant but I like the idea of those room coolers which have water running gently down a screen .Vertically running I`m not sure how wide or high they are but on top of cooling the room they also reduce excess humidity.[...]


How does running water in a room reduce humidity levels?

Regards,

Yes, I wondered that.

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The question leaves many open ends and variables. Mainly the problem cames down to how wide an angle of sunlight is able to attack the piano . Is the sun able to heat the piano from sunrise to sunset ? ( I have just been referring to "Satellite Look Angles "for my movable tv dish aerial.)
I have recently moved to larger house and my wife has changed her mind and wants the piano back where it gets sunlight later in the day . So we compromised and bought an old folding screen . The surface pictures are old and grubby but I stripped it down to the frame and will staple some reflective foil insulation internally before replacing the surface with pictures of humming birds and flowers . That will shade the piano from direct heat .The infra red would be what alters the tuning most . Ambient room temperature will be fine and in the winter the screen will be used to stop the wood burning stove attacking from the other direction .
I was surprised to see the makers of "Piano Covers" only make them as if they will be locked away for years .Nothing in elegant colours adapted for actual daily use .

Last edited by Jt2nd; 06/29/19 04:25 PM. Reason: Relevant afterthought .
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