Spalted Maple
Acer saccharum (Sugar Maple) or Acer rubrum (Red Maple) • Hardwood
Grain Pattern
Principally straight grain with dramatic zone lines (spalting) caused by fungal colonization; exhibits irregular dark streaks and pockets of discoloration.
Color Description
Pale cream to light tan background (sapwood) with black and dark brown variegated lines and patches. Tends to yellow or amber slightly over time with UV exposure.
Hardness Rating
950 to 1,450 lbf (Medium to Hard, depending on the extent of fungal decay/softness).
Durability Rating
Non-durable; the spalting process itself is a precursor to decay, leaving the wood susceptible to rot and insects if not dried and sealed.
Common Uses
Musical instruments (guitar tops), fine furniture, woodturning (bowls), cabinetry, veneer, and decorative inlay.
Geographic Origin
Northeastern North America and the Great Lakes region.
Market Value & Sustainability
Estimated Market Value
$10.00 - $25.00 per board foot depending on the intensity of the spalting and structural integrity.
Wood Age Estimate
Secondary growth harvested within the last 5-10 years; the rough-cut surface and moderate oxidation suggest it has been air-drying or in storage for several years.
Sustainability Status
Highly sustainable; not CITES listed or on the IUCN Red List. FSC certification is widely available.
Workability
Generally works well, but 'punky' or soft areas caused by spalting can lead to fuzzy grain or tearout. Sharp tools and stabilizes (like CA glue or wood hardener) are often required.
Notable Features
Distinctive black 'zone lines' created by fungi; potentially allergenic dust (fungal spores); lack of characteristic scent; excellent tonal properties.
Finish Recommendations
Film-building finishes like lacquer or polyurethane are best to seal in the fungal elements; sanding sealer is highly recommended to even out absorption in soft spots.
Identification Confidence
High; the characteristic black zone lines against a pale, fine-textured hardwood background are the definitive signature of spalted maple.