Question: Select the statement that is not true: Etching reagents may actually cause an obliterated serial number to appear and then disappear. Types of markings left

Select the statement that is not true: Etching reagents may actually cause an obliterated serial number to appear and then disappear. Types of markings left by tools depend on the type of tool used, angle of contact, force of contact, and what was contacted. Casts are often taken of tool marks for comparison purposes. Serial numbers can be obliterated by grinding, filing, or scratching. Tools make markings in exactly the same way each time they come in contact with a surface

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