What is the M2 Test Solution for Stainless Steel Insulated Cups? – Interpreting Results

Every cup has a story, and life has its warmth. Hello everyone, and welcome to "Dong Dong's Cup Talk" In previous discussions, I’ve mentioned simple methods to test whether your stainless steel cup is made of 304 stainless steel, including the use of testing solutions. However, I haven’t yet provided a detailed explanation. https://www.zhanyict.com/en/ProductsDetail-VB-10500.htmlRecently, I’ve received messages from followers asking about the reagent testing process. Today, I’ll dive deeper into this topic. Given the amount of information, I’ll break it down into several parts for clarity.

IV. Extended Knowledge: Other Testing Solutions and Color Reactions

8. Common Testing Solution Models

- Model: M2

Target Material: 304/201

Color Reaction: https://www.zhanyict.com/en/ProductsDetail-VB-10500.htmlReddish-brown / Red

- Model: M3

Target Material: 316/317

Color Reaction: Brownish-red → Dark green

- Model: N8

Target Material: Nickel Alloy

Color Reaction: https://www.zhanyict.com/en/ProductsDetail-VB-10500.htmlRosy red → Bright red

9. Comprehensive Stainless Steel Color Reaction Reference Table

- Material: 304

Color Reaction: https://www.zhanyict.com/en/ProductsDetail-VB-10500.htmlDark reddish-brown

Key Component: Ni ≥ 8%

- Material: 201

Color Reaction: Bright red

Key Component: High Mn / Low Ni (1-3%)

- Material: 316

Color Reaction: Brownish-red → Dark green (slow)

Key Component: Mo interference

- Material: 430

Color Reaction: No color change

Key Component: Nickel-free (Cr 17%)

V. Recommendations

- For home testing, prioritize M2 reagent (cost-effective).

- For important equipment procurement, https://www.zhanyict.com/en/ProductsDetail-VB-10500.htmlsupplement with spectrometer retesting (e.g., XRF).

- Avoid direct testing on precision equipment or decorative surfaces (may leave marks).

Important reminder: Dark reddish-brown = 304, bright red = 201, no color change = 430, and brownish-red turning green suggests 316!