Bert, The purple splotches on the pad seems to be "normal", apparently depending on the relative purity of the water, and perhaps interactions with the DC additive. The mold may have been a pre-existing condition -- I forget where you live and just how humid it may be at this time of year. Best wishes, Patrick Draine On Jul 6, 2010, at 10:24 AM, Albert Picknell wrote: > Hello List > > Sorry for double-posting this query, but I know there are some of you who are not on the pianotech list... > > I have a private client with a grey-market Yamaha U1H. I installed a Dampp-chaser a couple of months ago, and now the client is noticing a musty/mouldy smell that seems to be coming from the piano. Also, when I went to tune the piano a month or so after installing the Dampp-chaser, I noticed some purple-coloured blotches on the humidifier pads. > > What I suspect has happened is that the re-introduction of moisture into the piano has re-awakened dormant mould spores that have been there since the piano was brought over from Asia. My first inclination is to remove the Dampp-chaser, but I'm wondering whether any of you have dealt with a situation like this before, and have found any other effective solutions. > > By the way, the client has another piano (non-grey market) in the same apartment, also with a Dampp-chaser in it, that has no problem. > > Thanks, > Bert > > >
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