Sharp quartz? Like glass? I'm going to take a guess at this. My gut tells
me it doesnt matter much what material scratches the surface. I think what
does matter is the composition of the finish, and the depth of the finish.
Most commonly now, black pianos are finished with a black pigmented
polyester. Now if the scratch goes completely through the polyester, I think
the undercoat (if there is one) or the underlying wood might show. But
anything against black, is high contrast so I would *expect* the scratch to
appear as white or blueish-white.
Now if you really must know the answer to your question, I could assign a
little experiment here and ask you to scratch your favorite composer's name
into your piano, then you could examine the scratch in broad daylight and
report back to the group here, what the resulting color turns out to be.
Then we would all know for sure.... Of course if you choose not to do this,
most of us will understand.....
The more important question becomes: what to do (if anything) to hide,
minimalize or eliminate the scratch once it occurs?.(assuming it bothers
you.)..........................
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