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| For thin walled porcelain use a flashlight from the inside out |
Rub white starch into the mark
Press silly putty or similar into the mark, reverse image through photo editing
Rub graphite over the mark avoiding falling into the mark
Flashlight directed to the side
Electrical tape pressed over the mark, reverse editing
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| Flashlight to the side on graphite smudge over mark |
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Photograph in a light box |
