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Method 5:Sonication End-on

Group A: BC008

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After

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Detail

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Comments

Shinier, lost red residue around outer and inner ring and dirt removed (see detail).


Group B:BC019

Before

before

After

after

Detail

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Comments

Red residue completely gone on the ' L' , dirt removed, purple residue removed and scrates increased in size (see detail).


Group C: BC015

Before

after

After

before

Detail

Before                                                                       After

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Comments

Red residue completely removed, dirt removed, and scratches worsened slightly (see detail).