Nickel has a slight yellow tint to it, chrome has a slightly blue tint. They do look very similar, but you should be able to tell the difference, especially if you put a nickel part against a chrome part.
Also, the bubbling that occurs during chrome plating is a signal that the plate is being applied.
If you absolutely have to be sure, try stripping the chrome off again. If you use a reverse brush plating system, you will see a yellow stain on the wand where the chrome is removed. No yellow stain, no chrome.
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