The following recently appeared in the pianotech list that
may be of interest...

> Date: Wed, 01 May 1996 19:28:55 -0400
> From: PIANOBIZ@aol.com
> To: pianotech@byu.edu
> Subject: Re: Ivory bleaching question
> 
> On Sat, 27 Apr 1996, John Minor wrote:
> 
> > Can someone point me to a few articles in the Journal on the
> > subject of ivory keytop bleaching? Thanks.
> >   John,
>  
> There's an excellent article on bleaching ivories in the July,
> 1995 PTJ.  It's by Richard Wagner, RPT, and is on pp. 35-6.
> Steve Brady, RPT
> 
> Hello John
> 
> I would affirm the instructions included in that article on bleaching.
>  
> We followed them to the letter in setting up a black light shelf in
> our shop.
>  
> We used a cheap 48" shop-light fixture and black light fluorescent 
> bulbs.  Scuffing the ivories with fine sandpaper, covering them 
> with hydrogen peroxide soaked paper towels, and then sliding them 
> under the black lights for 24 hours really works.  Do this while 
> the keys are still on the keyframe if it's a grand action (sharps 
> removed).  We hang the light only two or three inches above the 
> keys.  The 48" black light bulbs are difficult to find.  I had to 
> go through a major electrical supplier, not my local lighting store.  
> We've been very happy and this method really does work, without 
> sanding off large amounts of ivory, and without relying on the 
> fickle presence of Mr. Sun. :)
> 
> David Sanderson
> Pianobiz@aol.com