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Genuine SS 304 stainless steel contains 18–20% chromium and 8–10.5% nickel. This specific composition is what gives it superior corrosion resistance, food-grade safety, and long-term durability. The problem is that cheaper grades like 201 and 430 are frequently sold as "304" and they look almost identical. Here is how to tell the difference.

1. Magnet Test (Start Here)

Hold a strong magnet against the product. Genuine SS 304 is non-magnetic or only very weakly magnetic. If the magnet sticks firmly, the item is almost certainly 201 or 430 grade, not 304. One caveat: 304 that has been stamped, rolled, or formed during manufacturing can develop a slight magnetic response, so use this as a first filter, not a final verdict.

2. Ni8 Reagent Test (Most Reliable at Home)

Purchase a Ni8 stainless steel testing solution these are nickel-detection kits widely available online. Apply a drop to the surface. On genuine SS 304, there will be no color change, or only a very slow, faint shift. On 201-grade steel, the solution turns red or dark brown within one minute. This is the most practical DIY confirmation method available without lab equipment.

3. Visual Inspection and Markings

Look for stamps reading "SUS 304," "18/8," or "18/10." These refer to the chromium-nickel ratio and are a baseline indicator of authenticity. Genuine 304 has a bright, smooth, silvery-gray finish. Warning signs include a yellowish or dull appearance and rust spots appearing early, particularly at welds or corners. This is especially relevant when buying bathroom fittings as covered in our guide on Is Stainless Steel or ABS Better for Muslim Showers in Hard Water Areas?, the material grade directly determines how a product holds up against moisture and hard water over time.

4. Acid Resistance Test

Apply a small drop of white vinegar to an inconspicuous spot and leave it for a few minutes. SS 304 will show zero reaction no bubbling, no discoloration, no rust. Lower-grade steels like 201 will bubble or develop rust spots quickly. This is a particularly useful test for kitchenware and bathroom fixtures, where the product will face constant water exposure.

5. Price Check

Nickel is expensive, and 304's high nickel content makes it significantly pricier than 201 or 430. If a product is labelled "SS 304" but priced unusually low compared to market rates, treat it as a red flag. Authentic 304 cannot be sold at 201 prices without someone cutting corners on composition.

6. Certification for Bulk or Industrial Purchases

For larger orders, always request a Mill Test Certificate (MTC) from the supplier, which documents the exact chemical composition of the steel batch. For high-value applications, a handheld XRF (X-ray Fluorescence) analyzer can verify the metal composition on the spot. When investing in bathroom fixtures that are built to last 10+ years, verifying the material grade upfront saves significant cost and frustration down the line.