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How to test stainless steel material with stainless steel identification potion？

May 12, 2023

Put a drop of the identification water on the steel surface, observe the time when the color turns red, and confirm the grade (model) of the stainless steel. The faster it turns red, the worse the material!
201 (authentic 201): turn red in about 50 seconds; manganese exceeds the standard.
301: Red in about 2-3 minutes, the color is very light, you need to look carefully.
304: Does not change red, brown or change color within 3 minutes.
316: From light green to dark brown within 3-5 minutes.

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