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How To Identify a Genuine Walrus Tusk
For centuries, walrus ivory—traditionally known as morse—has been one of the most highly prized materials for Arctic folk art, intricate tools, and historical carvings. Today, authentic walrus tusks and Alaska Native ivory carvings are highly sought-after by collectors worldwide.
However, with the market flooded with clever plastic replicas, bone carvings, and other types of animal ivory, knowing exactly what you are looking at is critical. Whether you are a seasoned collector or a curious beginner, this guide will show you exactly how to identify a genuine walrus tusk using simple visual and physical tests.
1. The Core Secret: Look for the “Oatmeal” Texture
The absolute easiest and most reliable way to identify genuine walrus ivory is by examining its inner structure. A walrus tusk is the only type of ivory that features two distinct layers of dentine:
- Primary Dentine (Outer Layer): This is a smooth, opaque, creamy-white layer that looks like classical ivory.
- Secondary Dentine (The Core): As a walrus grows, a secondary layer of dentine (osteodentine) fills its central pulp cavity. This core has a highly unique, marbled, crystalline, or “oatmeal” appearance (often described as looking like milky rice pudding).
Identification Tip: If a carving is cut deep enough to expose the core, or if you are looking at a raw tusk cross-section, you should see this distinct marbled center. When held up to a bright light, this secondary dentine core is strongly translucent, while the outer layer remains completely opaque.
2. Check the Grain (Say No to Schreger Lines)
Different animals leave different “fingerprints” on their ivory. A common mistake is confusing elephant or mammoth ivory with walrus ivory.
- Elephant & Mammoth Ivory: Features distinctive intersecting cross-hatch lines called Schreger lines or “engine-turning” patterns, which are easily visible in cross-sections.
- Walrus Ivory: Completely lacks Schreger lines. Instead, a whole walrus tusk is generally oval in cross-section with widely spaced indentations and fine longitudinal cracks running along its length.
3. Ivory vs. Bone: Look for the Tiny Dots
Bone is the most common natural substitute used to fake ivory. While they can look identical at a quick glance, their microscopic structures are entirely different.
- Bone contains a marrow system and blood vessels. Under close inspection or magnification, you will see tiny dark spots, pits, or faint lines on the surface—these are the Haversian canals that once carried blood.
- Genuine Walrus Ivory has no blood vessel system. It is completely solid, smoother, denser, and noticeably heavier than bone.
Summary Checklist: Real Ivory vs. Replicas
| Feature | Genuine Walrus Ivory | Bone | Plastic / Resin Fake |
| Internal Core | Distinct marbled, “oatmeal” texture | Spongy, porous marrow center | Completely uniform or solid |
| Surface Texture | Silky, heavy, ultra-smooth | Shows tiny dark pits or lines | May show mold lines or air bubbles |
| UV Light Test | Fluoresces bright white or dull yellow (patina) | Fluoresces white | Often fluoresces a bright blue or blue-white |
| Hot Needle Test | Chars slightly, smells like burning hair/tooth | Chars slightly, smells like burning bone | Melts easily, smells strongly of chemicals |
4. The Advanced Tests: UV Light & The Hot Needle
If visual inspection leaves you unsure, you can rely on two classic testing methods:
The Black Light Test
Place the item under a long-wave ultraviolet (UV) black light.
- Natural Ivory & Bone will typically fluoresce a bright, chalky white (or a dull, earthy yellow/brown if it has an authentic aged patina).
- Synthetic Plastics and Resins will almost always fluoresce a stark, bright blue or blue-white.
The Hot Needle Test (Use with Caution!)
Heat the tip of a needle until it is red hot and touch it to an inconspicuous spot on the piece (like the base).
- If it is plastic, the needle will plunge in effortlessly, melt the material, and give off a chemical smell.
- If it is genuine ivory, the needle will not penetrate; it will simply leave a tiny black scorch mark and smell like a trip to the dentist (burning tooth/hair).
5. Check the “Hollow Base” (The Pulp Cavity)
If you are looking at a whole uncarved tusk, look at the thick end where it attached to the walrus’s jaw (the proximal end).
- The Real Deal: A genuine walrus tusk is completely hollow for roughly the first third to half of its length. This conical pulp cavity is where the living tissue used to sit.
- The Catch for Fakes: Fake resin or plastic tusks are often completely solid (and artificially weighted) or have a very shallow, uniform drilled-out hole that doesn’t mimic a natural, tapering anatomical hollow.
6. Identify the Cementum (The Outer Ring)
Before getting to the primary and secondary dentine layers, a live walrus tusk is encased in a thin outer coating called cementum.
- The Appearance: In its raw or partially carved state, this outer layer acts like a natural “bark.” It is usually yellowish-brown, tan, or dark cream, and often features fine, parallel longitudinal ridges.
- The Identification Clue: If a carver only scraped away part of the surface, you will see a sharp, distinct boundary line where the darker, rugged cementum ends and the smooth, milky-white primary dentine begins.
7. Evaluate the Cross-Section Shape (Flattened Ovals)
The overall geometry of the tusk is a major giveaway.
- Walrus Tusks: Unlike elephant or mammoth tusks (which are almost perfectly round or circular in cross-section), a walrus tusk is distinctly flattened on the sides. If you look at a cross-section or look down the barrel of the tusk, it will form an elongated, compressed oval.
- The Curve: They also have a very distinct, gentle, uniform downward curve along their entire length.
8. Look for Longitudinal “Checking” (Age Cracks)
Ivory is anisotropic, meaning it responds to changes in moisture and temperature by expanding and contracting unevenly depending on the direction of the grain.
- Real Ivory: Over decades or centuries, this natural stress creates fine, hairline fractures called “checking.” On a walrus tusk, these cracks run strictly parallel to the length of the tusk (longitudinal).
- Fakes: Plastic and resin replicas don’t breathe or change with the climate, so they won’t feature these hairline fractures unless they were artificially scratched into the mold (which usually looks too uniform or deep under a magnifying glass).
When buying or selling walrus tusks, compliance with the law is paramount. In regions like the United States, the Marine Mammal Protection Act strictly regulates walrus ivory, generally permitting only Alaska Natives to harvest and carve new beach-found or hunted ivory. Ensure any piece you purchase comes with verifiable provenance and complies with local wildlife laws.
By mastering these visual and physical clues, you can confidently invest in authentic, beautiful pieces of Arctic history!
