>See _Under the Lid: The Art & Craft of the Concert Piano >Technician__by Steve Brady, p.123. The "marking" idea for slippery keytops was originally something Steve told me. I then somehow over time imagined he'd said beeswax, but by the time he told me he hadn't specified what kind of candle, I'd tried both beeswax and paraffin candles, and found the beeswax worked better. Susan Kline
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