Spalted Maple (likely Sugar Maple or Silver Maple)
Acer saccharum or Acer saccharinum • Hardwood
Grain Pattern
Growth rings are visible in the cross-section with prominent spalted figure, characterized by winding black zone lines (fungal boundaries). Texture appears fine and even.
Color Description
Pale cream to light tan background with dark brown to jet-black zone lines. Shows some grayish discoloration typical of spalting; tends to amber over time with UV exposure.
Hardness Rating
1,450 lbf (Hard) for Sugar Maple; lower (700-900 lbf) in areas where fungal decay has softened the fibers.
Durability Rating
Non-durable; highly susceptible to rot (the spalting is actually an early stage of decay) and insect attack if not dried and sealed.
Common Uses
Turning blocks, decorative bowls, high-end furniture accents, veneers, musical instrument tops, and jewelry boxes.
Geographic Origin
Eastern North America and parts of Southern Canada.
Market Value & Sustainability
Estimated Market Value
$15.00 to $25.00 per board foot depending on the intensity of the spalting and structural integrity.
Wood Age Estimate
The log section shows approximately 40-60 visible growth rings; the spalting indicates it was likely harvested or downed and left in a damp environment for 1-3 years before processing.
Sustainability Status
Not listed in CITES or IUCN Red List; widely available and sustainable, though specific spalted pieces are unique finds.
Workability
Generally easy to work, but 'punky' or soft areas caused by the fungus can tear out during planing or turning. Sharp tools are essential. It glues and finishes well.
Notable Features
Distinctive black zone lines caused by competing fungi; dust from spalted wood can be a respiratory irritant or allergen; lacks a distinct scent.
Finish Recommendations
Requires a stabilizing sealer if punky; clear film finishes like polyurethane, lacquer, or CA glue for small voids are recommended to highlight the contrast of the lines.
Identification Confidence
High; the combination of diffuse-porous end grain, distinct growth rings, and characteristic fungal zone lines is definitive for spalted maple.