Residue on a new hard-nitriding cast iron skillet

I have just purchased a new hard-nitriding cast iron skillet at a HomeGoods store (Brandani brand), and i'm having problems cleaning it before the first use. I've spent hours and hours washing it with soap, subbing with steel cloth, scrubbing more with salt and oil, and yet every time i dry it and then slide wet paper towel across, it gets black residue. The surface looks sliver'ish not dark, no idea why it emits dark residue, and why it still emits it after literally hours of washing and cleaning. Any ideas?

Also, despite saying it's cast iron, it feels more like thick carbon steel.

UPDATE: I ended up returning the skillet; my main concern is that Brandani brand is not known much and there is no guarantee the material (wherever it's carbon steel or some composite) is safe, as it feels like a Chinese knock off.

cast-iron carbon-steel

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Quick Answer about "Residue on a new hard-nitriding cast iron skillet"

Make sure the pan is clean and dry. ...

Turn on medium heat on your stovetop and apply one or two dabs of oil to the pan – about the size of a quarter.

Use a dish towel to rub the inside and outside of the pan with oil. ...

Rub the oil into the pan until it's dry.

What is the black residue on cast iron skillet?

They are most likely carbon deposits. This happens due to overheating of fats and oils. Using an oil with a low smoke point will carbonize at high temperatures and cause residue from the pores of your pan to rub off onto your food.

What is the white stuff on my cast iron skillet?

Calcium deposits can ruin the appearance of cast iron pans. Cast iron cookware is recognized for its even heat distribution, versatility and long-lasting durability, but it is porous and prone to stains. Exposure to minerals in hard water can cause calcium deposits to accumulate on cast iron pans.

How do you remove residue from cast iron?

Scrub off stuck-on bits: To remove stuck-on food, scrub the pan with a paste of coarse kosher salt and water. Then rinse or wipe with a paper towel. Stubborn food residue may also be loosened by boiling water in the pan. Dry the skillet: Thoroughly towel dry the skillet or dry it on the stove over low heat.

Why is the coating coming off my cast iron skillet?

The Cause: This can happen for a variety of reasons, such as not using enough fat or oil when cooking, using cookware that isn't well seasoned, or when breaking in new cookware that hasn't built up additional layers of seasoning.

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Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Magda Ehlers, Pixabay, Eva Elijas, Max Vakhtbovych