Spalted Maple
Acer saccharum (Sugar Maple) or Acer rubrum (Red Maple) • Hardwood
Grain Pattern
Generally straight but features dramatic spalted zone lines (black lines caused by fungi) and a slightly irregular, diffuse-porous texture.
Color Description
Pale creamy white to light reddish brown background. The spalted regions show dark, erratic black/brown lines and zones of variable coloration due to initial decay. Patina yellows slightly with age.
Hardness Rating
700 - 1,450 lbf (Soft to Hard depending on specific species and extent of decay/softening from spalting)
Durability Rating
Non-durable; very susceptible to rot and insect attack if not stabilized or kept dry.
Common Uses
Turning blocks, decorative bowls, high-end furniture accents, veneers, guitar tops, and specialized craft items.
Geographic Origin
Northeastern North America and the Great Lakes regions.
Market Value & Sustainability
Estimated Market Value
$10.00 - $25.00 per board foot depending on the intensity of the spalted figure.
Wood Age Estimate
Modern lumber, likely harvested and kiln-dried within the last 2-5 years; spalting occurs during a specific stage of seasoning/decay post-felling.
Sustainability Status
Highly sustainable; not CITES listed and generally available as FSC certified. Spalting is a natural process rather than a rarity of the species itself.
Workability
Generally good, but the spalted (rotted) areas can be soft or "punky," requiring sharp tools or stabilizing resins to avoid tearout during machining.
Notable Features
Features unique black zone lines caused by fungal interaction. Fine texture and lacks a distinct scent. Dust can be an allergen or irritant; respiratory protection is recommended due to fungal spores.
Finish Recommendations
Film-building finishes like clear lacquer or polyurethane are recommended to seal the porous spalted areas. Sanding sealer or CA glue can be used to stabilize soft spots before final finishing.
Identification Confidence
High; the distinct black zone lines against a pale, fine-textured hardwood background are the signature indicators of spalted maple.