List: Titanium dioxide (commonly used as a paint pigment)mixes easily with PVC-E glue, and has very high opacity. It is also used as a filler/coating for fine paper-making. You can buy it from paint supply wholesalers. (Often called Titanium White). That's what I use when I have to replace ivories. I didn't invent it--I learned it at George Brown College. I hope someone finds it useful. Tim Keenan Terrace BC
This PTG archive page provided courtesy of Moy Piano Service, LLC