Juglans hindsii
Claro Walnut
California's figured walnut, and the wildest figure in the walnut family. Graft unions between English walnut and Hinds rootstock produce violet, gold and marbled patterns no other walnut can match.
- Cultivé hors d’Europe et importé par des dépôts européens.
- Groupe botanique. Les résineux sont des conifères, les feuillus sont des arbres à feuilles larges.
- Famille botanique à laquelle appartient l’essence.
Être informé du prochain arrivageEssence de référence. Aucun plateau en stock pour le moment.
Convient-il à votre projet ?
Idéal pour
- Heirloom dining tables
- Statement live-edge slabs
- Executive desks
- Gun stocks
- High-end cabinetry feature panels
Aucun plateau en Claro Walnut dans la sélection actuelle
Essences similaires en stock
Aucun plateau en Claro Walnut pour le moment. Ces essences conviennent aux mêmes projets et sont disponibles.
Soyez informé des arrivages en Claro Walnut
Nous vous envoyons un e-mail lorsque de nouveaux plateaux en Claro Walnut arrivent chez KORENA. Chaque plateau est unique, mieux vaut donc être prévenu rapidement.
Aspect du bois
Son aspect
Heartwood ranges from chocolate brown to purple-grey, often streaked with violet, gold and reddish tones. Sapwood is pale cream and usually contrasts sharply. Figure is the headline: fiddleback, marbled, feathered crotch, and dense burl clusters are common in graft-figured boards. Grain is typically straight in clear sections but wild around figure. Medium texture, satin natural lustre.
- Chocolate-brown to purple-grey heartwood
- Violet, gold and reddish streaking
- Pale cream sapwood with sharp contrast
- Fiddleback, marbled and crotch figure common
- Often heavily figured; prized for slabs.
Travail du bois
Son travail en atelier
Works well by hand and machine across sawing, planing, sanding, turning and carving. Glues and screws without drama. Wild grain around figure and burl tears out easily, back off feed rates, use sharp tooling, and finish-sand rather than hand-plane figured zones. Steam-bending is moderate at best; not the wood for tight curves. Note: published laboratory data for Claro is limited. No reliable MOR or MOE figures exist. For structural calculations, treat mechanical properties as broadly comparable to Black Walnut (Juglans nigra) and design with that proxy in mind.
Finition
Takes oil, hardwax and lacquer cleanly. Oil finishes deepen the violet and gold tones and lift the chatoyance in fiddleback areas, worth a sample board before committing. Sand to 180–220 grit; going finer can close the surface and dull the figure. Open pores will show under high-build finishes, so grain-fill if a glass-flat surface is required.
Séchage
Dries at a moderate rate. Shrinkage is moderate (radial 4.0–4.7%, tangential 6.0–7.0%, volumetric 10.2–11.2%) with a tangential-to-radial ratio around 1.5, manageable, but figured and crotch sections can check or honeycomb if pushed. Slow kiln schedules and weighted stickering are standard for slab stock. Acclimatise indoors for several weeks before machining.
De combien va-t-il bouger ?
Le bois gonfle et se rétracte en largeur selon que l’air devient plus humide ou plus sec. Estimez le mouvement saisonnier d’un plateau en Claro Walnut avant de concevoir les fixations.
Mouvement saisonnier attendu
environ 7,4 mm
Fixez le plateau avec des taquets ou des équerres à trous oblongs, sans colle ni vis trop serrées.
Modèle de retrait linéaire : largeur × (retrait ÷ 28 % de point de saturation des fibres) × variation saisonnière d’humidité. Utilise un retrait tangentiel de 6,5 % pour le Claro Walnut. Il s’agit d’une estimation de conception, pas d’une garantie.
Son prix
Sécurité et origine
- Cultivé hors d’Europe et importé par des dépôts européens.
- Statut sur la Liste rouge de l’UICN : évaluation mondiale de la conservation de cette essence.
Walnut dust contains juglone and is a known respiratory and skin sensitiser. Use extraction at the source, wear an FFP3 mask when sanding, and keep offcuts away from horses and dogs, juglone is toxic to both. Cured finished surfaces are food-contact safe.
Lire le guide completNotes détaillées sur la figure, l’évolution de la couleur, le travail et la stabilité.
What Claro Walnut actually is#
Juglans hindsii is the northern California black walnut, and it produces the most dramatic figure in the walnut family. Its reputation rests on something that is not really a property of the species at all.
Claro is widely used as rootstock for English walnut, Juglans regia, in Californian orchards. Where the two species are grafted together, the grain at the union becomes violently disrupted, producing marbled patterning in violet, gold, orange and near black that neither species shows on its own.
Slabs cut through or near that graft union carry figure no other walnut can match, and they are priced accordingly. Plain Claro away from the union is a good walnut; graft figured Claro is a different proposition entirely.
The missing numbers#
Density at 640 kg per cubic metre and Janka hardness at 5,030 N are sourced and displayed on the species record. Modulus of rupture and elastic modulus are not shown, and that is deliberate.
Published laboratory data for Claro is limited, and no reliable MOR or MOE figures appear in the references KORENA cites. Borrowing values from Juglans nigra or Juglans regia and presenting them as Claro would produce a page that looks complete and specifies a wood that was never tested.
The practical consequence: do not use Claro where a calculated load path depends on assumed stiffness or bending strength. For a tabletop, a cabinet or a decorative slab, which is what this species is actually for, the missing figures do not constrain the decision.
Questions des acheteurs
Questions fréquentes des acheteurs
What makes Claro Walnut figure so dramatic?
Much of it comes from graft unions. Claro is widely used as rootstock for English walnut orchards, and where the two species join, the grain becomes violently disrupted, producing marbled violet, gold and dark brown patterning that neither species shows alone. Slabs cut through that union carry figure no other walnut can match.
Why are no MOR or MOE figures listed?
Published laboratory data for Claro is limited and no reliable modulus of rupture or elastic modulus values exist in the references KORENA cites. Rather than borrow figures from Juglans nigra or regia and label them Claro, those fields are left empty. Density at 640 kg per cubic metre and Janka at 5,030 N are sourced and shown.
How does it compare with Black Walnut?
Claro is harder at 5,030 N against 4,490 N and considerably more variable in colour, running from pale gold through orange brown to near black, often within a single slab. Black walnut is more uniformly chocolate. Claro is bought for figure and colour variation; black walnut for consistency.
Is walnut dust a hazard?
Propriétés mécaniques
Données techniques
Valeurs de référence publiées. Lorsque les sources divergent, la plage est indiquée et la valeur courante sert aux échelles ci-dessus.
| Densité (kg/m³)Masse par mètre cube à environ 12 % d’humidité. Un bois plus lourd est généralement plus dur et plus résistant. | 600–680 kg/m³valeur courante 640 kg/m³ |
|---|---|
| Dureté Janka (N)Force nécessaire pour enfoncer à moitié une bille d’acier dans le bois. Mesure standard de la résistance à l’enfoncement. | 4,700–5,400 Nvaleur courante 5 030 N |
| Retrait radialRetrait perpendiculaire aux cernes, du bois vert au bois anhydre. Les planches sur quartier travaillent dans ce sens. | 4.0–4.7 % |
| Retrait tangentielRetrait dans le sens des cernes. Les planches sur dosse et la plupart des plateaux travaillent dans ce sens. | 6.0–7.0 % |
| Retrait volumiqueVariation totale de volume du bois vert au bois anhydre. Une valeur basse indique une meilleure stabilité. | 10.2–11.2 % |
