Tom, Thanks for the heads up on shelf life! -John Parham > -------- Original Message -------- > Subject: Re: [pianotech] UV lamp for ivory bleaching > From: "Tom Servinsky" <tompiano at bellsouth.net> > Date: Thu, September 16, 2010 4:16 am > To: <pianotech at ptg.org> > > > Keep in mind that there is a shelf-life to the heavy duty 35% peroxide. It > will become ineffective by the time you've used 1/4 th of the bucket. Also > it's necessary to store it in complete darkness. Exposing the peroxide to > any light start deceasing it's strength. I buy mine in 1 gallon jugs and > even with the utmost care in storing it, usually starts to become > ineffective well before I've gone through 1/2 the jug. Luckily the peroxide > isn't an expensive material to purchase. > I think the point of the thread was avoiding putting the ivories out in the > sun, adding additional heat to the mix. The heat and the peroxide mixed, can > break down the glues holding the ivories on.The UV tubes mimic the sun's > rays without the heat. However the peroxide is still needed to act as the > bleaching agent. > Tom Servinsky > ----- Original Message ----- > From: <johnparham at piano88.com> > To: <pianotech at ptg.org> > Sent: Thursday, September 16, 2010 12:41 AM > Subject: Re: [pianotech] UV lamp for ivory bleaching > > > Patrick, > > If it were up to me, I would buy a 5-gallon bucket of 35% hydrogen > peroxide from a chemical supplier (I had to go to our local chemical > manufacturer.) Hydrogen peroxide is very caustic, so wear gloves. > > Brush it on the ivories and wait for it to evaporate. Reapply as > necessary to get the desired shade of "bleached out white." > > The nice thing about HP is that once it finishes its ionic exchange, it > stops working, so there is no danger of any residue in the ivories > interacting with something else later on; it becomes inert. > > A 5-gallon bucket used full strength, by the way, is a lifetime supply. > It cost me around $40.00. > > -John Parham, RPT > Hickory, NC > > > -------- Original Message -------- > > Subject: [pianotech] UV lamp for ivory bleaching > > From: Patrick Mackey <patrickmackeyrpt at yahoo.com> > > Date: Wed, September 15, 2010 8:00 pm > > To: pianotech at ptg.org > > > > > > List, > > I tried to post this earlier but it hasn't shown up yet, > > > > Does anyone have advice about buying a UV lamp for bleaching ivories? > > They are > > pretty expensive, I'd like to get some advice before shelling out the > > bread. > > > > Thanks, > > > > Patrick Mackey > > New Orleans
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