Close-up of a clay-tempered T10 katana blade showing its hamon

Clay-Tempered or Etched? A 5-Minute Hamon Check for Your New Sword

Short answer: Unbox the sword in good light, wipe off the transport oil, and tilt the blade slowly under a single light source. A genuine clay-tempered hamon has a soft, misty boundary that sparkles and shifts as the angle changes. An etched line stays the same from every angle and has a hard, printed edge. If a sword sold as clay-tempered turns out to be etched, Australian Consumer Law says goods must match their description, so contact the seller with photos.

Key takeaways

  • A real hamon is the visible boundary between a hardened edge and a softer spine, created by clay tempering before the quench.
  • You can check it at home in five minutes with one lamp and a clean cloth.
  • The listing should say clay-tempered and name a high-carbon steel such as T10 or 1095.
  • Under Australian Consumer Law, goods must match their description and be of acceptable quality.

Before you start

If you want the background on how a smith applies clay and quenches the blade, step 5 of How a Longquan Sword Is Made explains it. This guide is the practical side: checking the sword in your hands.

You need a clean microfibre cloth, a single lamp or a window with direct light, and the product page open on your phone so you can compare.

The 5-minute check

  1. Remove the transport oil. Hold the sword edge-up and wipe from the spine toward the edge with a clean cloth. Oil hides the detail of a hamon.
  2. Find the line. Hold the blade flat at arm's length. You should see a lighter, frosty band along the edge and a darker, brighter body above it.
  3. Tilt slowly. Rotate the blade a few degrees at a time under one light. A clay-tempered hamon is made of tiny crystals in the steel, so its boundary twinkles, fades and reappears as the angle changes. An etched or brushed pattern looks the same however you hold it.
  4. Look closely at the boundary. A real hamon blends into the body over a millimetre or more, often with small wisps or clouds. An etched line has a sharp, even edge, like ink on paper.
  5. Follow it to the tip. On most clay-tempered blades the hamon turns and continues into the point area (the boshi). A pattern that stops abruptly or looks repeated may be decorative.
  6. Compare with the listing. Check the Blade material row in the specification table. It should say clay-tempered and name the steel.

Then oil the blade again. Our sword care guide shows how.

Steel and price are clues too

Clay tempering works best on high-carbon steel, because that is what hardens strongly at the edge. A sword listed as 1045 with a dramatic hamon at a very low price is more likely to be etched. Our sword steel guide explains why T10 and 1095 are the usual choices.

What if it does not match the listing?

The Australian Competition and Consumer Commission (ACCC) explains that goods sold to consumers come with automatic consumer guarantees. Two matter here:

  • Match the description: goods must correspond with the description the business gave, including what is written on its website.
  • Acceptable quality: goods must be safe, durable, free from defects and acceptable in appearance and finish.

So if a sword is sold as clay-tempered and clearly is not, that is a description problem, not a matter of taste. Take clear photos of the blade at two or three angles and of the packaging, then contact the seller. See our returns and refunds policy for how we handle this. This is general information, not legal advice; NSW Fair Trading and the ACCC have more detail on your rights.

Frequently asked questions

Why is the hamon on my sword hard to see?

Transport oil, fingerprints and bright overhead lighting all hide it. Clean the blade and use one light source at a low angle. Some fine polishes also show a subtle hamon rather than a dramatic one.

Does a real hamon look like the product photos?

Broadly, yes, but photographers use controlled light to make the hamon stand out. Every clay-tempered blade is slightly different, so small variations from the photos are normal.

Can a sword have a real hamon and an etched pattern?

Yes. Some makers lightly etch a genuine hamon to make it easier to see. That is different from etching a fake line onto a blade that was never clay-tempered.

Can I polish the hamon to make it brighter?

Not with household abrasives. They scratch the polish and can blur the hamon. Traditional polishing is a specialist job.

Sources

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