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Originally Posted by rx9790
How would I know the base metal?
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You learn as part of the job of plating. Certain metallic compounds don't take kindly to the chemicals used in plating. Some cannot be plated. As part of plating, you'll need to be able to tell or test for various metal bases. I'm pretty sure most know the difference between lead and aluminum but some metals get harder to distinguish. Weight, color, appearance, magnetism and reactions to acids are a few tests. You'll need to learn these to do plating.
Judging by your comment, the frame could have been die cast too. Like stainless steel, die cast needs special pretreatment before plating.