Marble’s Reagent, 500 mL



Marble’s Reagent (AKA Marble’s etch) is a metallographic etchant for micro-etching 300 series stainless steels, nickel, and cobalt-based superalloys. The etchant will darken austenitic grains, attack sigma phases, and show grain flow. Please note that scratch marks from sample preparation will also become apparent. This product is made with reagent grade chemicals. It is listed in ASTM standard E 407 as formula number 25: “Marble’s”.

If you are looking for a macro-etching chemical for 304 or 316 welds, please try our stainless steel weld etch.

User Instructions:

  • To etch a corrosion-resistant alloy, the metal surface has to be etched as soon it’s polished, cleaned and dried without delay. Otherwise, the metal surface will passivate.
  • Immerse or swab the polished surface few seconds to a minute.


Nalgene® Leakproof Bottle, HDPE.

316 stainless steel etched with Marble's Reagent

Additional information

Weight 1.5 lbs
Dimensions 4.4 × 3.5 × 6.5 in
  • Now serving US & Canada.

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