Wood ID: what craftspeople read in a board
How woodworkers and furniture makers identify timber species by eye — and why it matters for joinery, finishing, and sourcing decisions.
Why species identification matters in woodworking
Two boards that look similar at first glance can behave completely differently in the workshop. Red oak and white oak are visually close but have fundamentally different cellular structure: white oak has tyloses that plug the vessel pores, making it impermeable to liquids and suitable for tight cooperage and boat-building; red oak lacks tyloses and is unsuitable for waterproof containers despite identical appearance. Hard maple and soft maple share the same visual character but differ by a full point on the Janka hardness scale, with direct consequences for tool wear, finishing, and floor durability. European and American walnut look nearly identical but have different working properties, grain stability, and response to steam bending. Misidentifying a species can result in joinery that fails, finishes that don't take properly, or sourcing a material with inadequate structural properties for its intended use. WoodLens species identification supports these practical decisions, not just curiosity.
Reading figure: quilted, bird's eye, crotch, and curly grain
Figure is the visual pattern created when irregularities in grain direction or structure catch and reflect light differently across the surface of a board. Curly grain (also called tiger maple or fiddleback) results from undulating wood fibre that creates alternating light and dark bands across the width of a board. Bird's eye figure, found almost exclusively in hard maple, results from small conical depressions in the growth rings, possibly created by bud suppression, that appear as eye-like spots when the board is surfaced tangentially. Quilted figure shows a three-dimensional puffed appearance, most dramatically in west coast big-leaf maple, created by a complex interlocked grain. Crotch figure appears in wood taken from the junction between trunk and major branch, where grain lines from two directions converge to create feathery plume patterns. Figure is a product of how the wood is cut relative to the grain irregularity — the same tree can yield figured and plain boards depending on the sawing orientation. WoodLens can identify species from figured boards by looking past the figure to the underlying anatomical character of the pores and rays.
Density, weight, and working properties as identification aids
Wood density, expressed as specific gravity (the ratio of wood density to water density at a standardised moisture content), ranges from balsa (0.12) at the lightest extreme to lignum vitae (1.05, sinking in water) at the heaviest. A handful of common timbers cluster around 0.6–0.7 — oak, ash, walnut, cherry — making density on its own an incomplete identifier. But in combination with visual features, density weight-in-hand is a fast supplementary check: picking up a board and finding it dramatically heavier or lighter than expected for the stated species is an immediate red flag. Working properties — how cleanly the grain cuts with a hand plane, whether end grain tears or cuts cleanly, how well surfaces hold a finish — are similarly species-characteristic without being definitive alone. These hands-on properties complement WoodLens's visual analysis and provide the practical verification that matters most in the workshop.
FAQ
How do I tell oak from ash on an end-grain surface?
Both oak and ash are ring-porous with large, visible earlywood pores. The most reliable separator is ray width: oak has both wide and narrow rays, with the wide rays visible to the naked eye as lines radiating from the centre of the log — dramatically visible as ray fleck on quartersawn oak faces. Ash has only narrow rays, none visible without a hand lens. In cross-section, oak's rays create a pattern of short radial lines; ash cross-sections look more uniform. Ash also tends toward straighter, cleaner grain while oak is more variable, and ash's earlywood pore ring is typically narrower relative to the latewood than oak's.
What causes the ray fleck pattern in quartersawn oak?
Oak has unusually wide and tall rays (medullary rays) that are visible to the naked eye in cross-section as light-coloured lines radiating from the centre. When a board is sawn radially — with the growth rings running roughly perpendicular to the face — these wide rays are cut tangentially across their full width, exposing broad faces of ray tissue that create the distinctive silver or mirror-like fleck pattern on the board face. The same rays appear only as fine lines in flat-sawn oak because they are cut across their narrow width. The quartersawn orientation exposes the full ray face and is prized both for the figure and for dimensional stability, as quartersawn boards move less with humidity changes than flat-sawn boards from the same species.
How accurate is WoodLens for identifying common workshop timbers?
WoodLens performs best on well-documented commercially important species with distinct anatomical features — oak, walnut, maple, cherry, ash, pine, and major tropical hardwoods. For these species, a clear photograph of a freshly prepared surface showing end grain or a prominent face-grain pattern returns reliable identification with high confidence scores. Accuracy is lower for species with very similar anatomy (closely related maple species, different pines), unusual processing states (heavily weathered or charred wood), and obscure or rarely documented species. Physical tests — density, hardness, scent — help resolve ambiguous cases.