Truth About Nyalox Brushes and Headstones

Truth About Nyalox Brushes and Headstones

By Brad Manzenberger
Conservator, Stone Revival Historical Preservation

Do Nyalox wheel brushes on drills remove stone material from a grave marker? What about using D2 Biological Solution and a nylon bristled hand brush?

Those are the questions to be answered here. Any other issue is for another study. A controlled environment is not necessary as the sole purpose is to see if either of these cleaning methods remove original stone material. Bias does not play any role as the method either removes stone material or it doesn’t.

This is a Grit Chart for Nyalox wheel brushes.
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Phase 1

In Phase 1 I cleaned one half of a piece of marble with a grey Nyalox wheel brush and water (Labeled 1, 2 and 3 in the photos) and D2 Biological Solution and a nylon bristled hand brush on the other half (labeled A, B and C in the photos.)

Measurements before cleaning with a grey Nyalox brush on a corded drill:

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Measurements before cleaning with D2:
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Measurements after cleaning with a grey Nyalox brush on a corded drill:

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Measurements after cleaning with D2:

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This stone was only gently soiled, as seen along the edge of the stone.

The face of the stone after cleaning with both methods.
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It is clear that just a quick gentle brushing with Nyalox on a drill removes stone material. In Phase 1 testing one-hundredth of an inch was removed. Srubbing by hand with D2 did not show any sign of loss of stone material.

I did not clean the edge as it had no bearing on the width of the stone.

Phases 2 and 3 can be seen here.


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