how to identify the material 201 and 304 during buy stainless steel wire mesh

The chemical formula of 201 is that the chemical formula of 1Cr17Mn6Ni5304 is 06Cr19Ni10; the main difference between them is nickel chromium, 304 is 19 chromium and 10 nickel, and 201 is 17 chromium 5 nickel.
201 stainless steel contains manganese, but 304 is not; from the color, 201 stainless steel is darker than 304, and 304 is brighter than 304, but this is not easily distinguishable by the naked eye.
Because the nickel content is different, the 201 corrosion resistance is far less than that of 304, and the acid and alkali resistance 201 is not 304 better, because the 201 carbon content is higher than 304, so 201 to 304 should be hard and brittle, and the 304 toughness is better. The scratch on the 201 surface with a hard knife is generally very obvious, and the scratch on the 304 is not very obviously

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