[pianotech] UV lamp for ivory bleaching

[johnparham at piano88.com]

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