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Nital, picral, Kalling, Vilella, Marble, Keller, Murakami, Beraha, Klemm and aqua regia etchants - Reagents & Materials

What you need to perform one test: reagents, kits, consumables, equipment and quality controls, with their official basis. Quantities follow the validated method or the manufacturer's instructions for use (IFU).

Back to Metallographic Etchants

Materials science electronics & nondestructive testing · General

Nital, picral, Kalling, Vilella, Marble, Keller, Murakami, Beraha, Klemm and aqua regia etchants

Metallographic microstructure

Reagents & stains

ItemProcure
Separate alloy-specific variants: nital (nitric acid/alcohol)Per validated method / manufacturer IFUMerckRecommended · Official manufacturer site
Picral (picric acid/alcohol)Per validated method / manufacturer IFUMerckRecommended · Official manufacturer site
Kalling No.2 (copper chloride/HCl/alcohol)Per validated method / manufacturer IFUMerckRecommended · Official manufacturer site
Vilella (picric acid/HCl/alcohol)Per validated method / manufacturer IFUMerckRecommended · Official manufacturer site
Marble (copper sulfate/HCl/water)Per validated method / manufacturer IFUMerckRecommended · Official manufacturer site
Keller (nitric, hydrochloric and hydrofluoric acids/water)Per validated method / manufacturer IFUMerckRecommended · Official manufacturer site
Murakami (ferricyanide/alkali)Per validated method / manufacturer IFUMerckRecommended · Official manufacturer site
Selected Beraha sulfite formulationPer validated method / manufacturer IFUMerckRecommended · Official manufacturer site
Selected Klemm thiosulfate/metabisulfite formulationPer validated method / manufacturer IFUMerckRecommended · Official manufacturer site
Aqua-regia acid system. Select one defined variantPer validated method / manufacturer IFUMerckRecommended · Official manufacturer site

Kits

ItemProcure
Optional supplier-preparedPer validated method / manufacturer IFUMerckRecommended · Official manufacturer site
Alloy-matched etchantPer validated method / manufacturer IFUMerckRecommended · Official manufacturer site
Not a universal multi-etchant kitPer validated method / manufacturer IFUMerckRecommended · Official manufacturer site

Consumables & materials

ItemProcure
Metal couponsPer validated method / manufacturer IFUMerckRecommended · Official manufacturer site
Mounting resin/mouldsPer validated method / manufacturer IFUMerckRecommended · Official manufacturer site
Abrasive papersPer validated method / manufacturer IFUMerckRecommended · Official manufacturer site
Diamond/alumina polishPer validated method / manufacturer IFUMerckRecommended · Official manufacturer site
Compatible etch vesselsPer validated method / manufacturer IFUMerckRecommended · Official manufacturer site
TongsPer validated method / manufacturer IFUMerckRecommended · Official manufacturer site
Rinse consumablesPer validated method / manufacturer IFUMerckRecommended · Official manufacturer site

Equipment

ItemProcure
Sectioning sawPer validated method / manufacturer IFUMerckRecommended · Official manufacturer site
Grinder/polisherPer validated method / manufacturer IFUMerckRecommended · Official manufacturer site
Reflected-light metallurgical microscopePer validated method / manufacturer IFUMerckRecommended · Official manufacturer site
Chemical extractionPer validated method / manufacturer IFUMerckRecommended · Official manufacturer site
Materials-compatible containmentPer validated method / manufacturer IFUMerckRecommended · Official manufacturer site

Controls & reference materials

ItemProcure
Known alloy/microstructure referencePer validated method / manufacturer IFUMerckRecommended · Official manufacturer site
Unetched comparison surfacePer validated method / manufacturer IFUMerckRecommended · Official manufacturer site
Microscope scale calibrationPer validated method / manufacturer IFUMerckRecommended · Official manufacturer site

Official basis (Method): ASTM E407-23 covers metal and alloy microetching. Select the alloy-specific recipe from the controlled standard; preparation and grain-size standards have different scopes.

Procurement note: Use the full E407 alloy entry and current SDS. HF, picric-acid and strong-oxidant variants require their facility-approved storage/containment; these constituent labels are not preparation instructions.

Sources:G069 ASTM International

Procurement links open the manufacturer's or distributor's page in a new tab. STAINIC does not sell these items; always buy products validated for diagnostic use and follow local regulations.

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