Ricca Chemical

Marble's Reagent (Marble's Etch), 500 ml

Part Number:
Lead Time:
10-14 days
FREE SHIPPING on most orders over $50*
500 ml / 16 ounce
Catalog Number:
CAS Number:
7732-18-5, 7647-01-0, 7758-99-8
DOT Rated:
HazMat Transport Fee Required
Price: $103.56


Marble's Reagent. Also called Marble's Etch, this metallographic etchant is for etching 300 series austenitic 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.

User Instructions:

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


  • Manufacturer Part Number: R4621400-500A
  • Grade: ACS grade
  • CAS#: 7732-18-5,7647-01-0,7758-99-8
  • Size: 500 mL Natural Poly bottle
  • Boiling Point: Approximately 100°C
  • Appearance: Green liquid
  • Physical State: liquid
  • Shelf Life (months): 24

Note: These chemicals are for research, manufacturing and laboratory use only. Not intended for use in or on the human body. All orders must ship to a legal business or research organization's address. An official Declaration of Use form may be required for specific regulated products. Most chemicals cannot be expedited.

HazMat items can only ship within the US. HazMat items always require special DOT handling and in rare cases may incur additional fees. Request a quote for the most accurate pricing.

Additional information on Hazardous Material designation:

  • DOT UN Number: UN1789
  • DOT Proper Shipping Name: Hydrochloric Acid Solution
  • DOT Hazard Class: 8

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and reproductive harm. Prop 65 Warning

Please note: This product is not returnable.

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