XRF test results for small unbranded Made in USA 6-1/2 inch cast iron skillet. What is plain cast iron made of exactly?

XRF test results for small unbranded Made in USA 6-1/2 inch cast iron skillet. What is plain cast iron made of exactly?

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XRF test results for small unbranded Made in USA 6-1/2 inch cast iron skillet. What is plain cast iron made of exactly?

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