Sapwood Demarcation and Epoxy Table Design
When selecting timber slabs for a custom epoxy river table, the edge profile dictates the visual relationship between raw timber and cured resin. A critical botanical trait documented in the CIRAD Tropix 7 technical sheets is sapwood demarcation. In living trees, sapwood is the active outer layer of wood responsible for nutrient and fluid conduction, surrounding the mature inner heartwood.
Depending on the species, the boundary between sapwood and heartwood may be sharply defined, diffuse, or completely indistinguishable. Understanding whether a wood possesses clearly demarcated sapwood allows epoxy artisans to plan table borders intentionally—choosing whether to showcase a high-contrast pale margin or maintain a solid, unbroken heartwood hue against the resin channel.
Species Grouped by Demarcation Profiles
Data compiled by CIRAD categorizes timber species based on how distinctly the outer sapwood separates from the inner heartwood. Below is a grouped summary of notable exotic and imported timbers evaluated for tabletop craft:
- Clearly Demarcated Sapwood: These timbers display an explicit, crisp line separating the pale outer sapwood band from the colored heartwood core. Prominent examples include African Padauk (red heartwood), Wenge (dark brown heartwood), Grenadillo (black heartwood), Muirapiranga / Bloodwood (dark red heartwood), Guanacaste (brown heartwood), Zebrano (light brown heartwood), Afzelia (red brown heartwood), Ayan (yellow heartwood), Beli (brown heartwood), and Merbau (brown heartwood).
- Not Clearly Demarcated Sapwood: In these species, the transition from sapwood to heartwood occurs along an indistinct gradient rather than a definite visual boundary. Examples include African cordia (light brown), Agba (light brown), Angelim pedra (orange yellow), Cerejeira (yellow brown), European Walnut (brown), Idigbo (yellow), Snakewood (orange yellow), and Yellowheart (yellow).
- Not Demarcated Sapwood: Species in this category exhibit virtually no visible separation between sapwood and heartwood, featuring uniform coloration across the entire cross-section. Timbers in this group include European Ash (creamy white), European Beech (light brown), Curupixa (light brown), Jelutong (light yellow), Pau marfim (creamy white), and Pau mulato (yellow brown).
- Sapwood Absent: Timbers like Coconut wood lack true botanical sapwood divisions, displaying a continuous red-brown structural appearance.
| Wood | Sapwood | Heartwood colour |
|---|---|---|
| Coconut wood | Absent | Red brown |
| Abarco | Clearly demarcated | Brown |
| Abiurana vermelha | Clearly demarcated | Red brown |
| African Padauk | Clearly demarcated | Red |
| African walnut | Clearly demarcated | Brown |
| Afzelia | Clearly demarcated | Red brown |
| Alan / Alan-Batu | Clearly demarcated | Red brown |
| Alep | Clearly demarcated | Yellow brown |
| Alumbi | Clearly demarcated | Red brown |
| Amesclào | Clearly demarcated | Orange yellow |
| Ananta | Clearly demarcated | Red brown |
| Angelim amargoso | Clearly demarcated | Yellow brown |
| Angelim vermelho | Clearly demarcated | Red brown |
| Angelin | Clearly demarcated | Red brown |
| Anzèm / nténé | Clearly demarcated | Red brown |
| Araracanga | Clearly demarcated | Light brown |
| Ariella | Clearly demarcated | Light brown |
| Atlas Cedar | Clearly demarcated | Yellow brown |
| Ayan | Clearly demarcated | Yellow |
| Baracara | Clearly demarcated | Yellow brown |
| Basralocus | Clearly demarcated | Brown |
| Batibatra | Clearly demarcated | Brown |
| Beli | Clearly demarcated | Brown |
| Benguet pine | Clearly demarcated | Orange yellow |
| Berlinia | Clearly demarcated | Pinkish brown |
| Bilinga / Opepe | Clearly demarcated | Orange yellow |
| Billian | Clearly demarcated | Yellow brown |
| Bintangor | Clearly demarcated | Dark red |
| Bitis | Clearly demarcated | Red brown |
| Black Guarea (Bossé Foncé) | Clearly demarcated | Orange brown |
| Black wattle | Clearly demarcated | Brown |
| Brown sterculia | Clearly demarcated | Red brown |
| Cabreuva | Clearly demarcated | Red brown |
| Cardeiro / Cedrinho | Clearly demarcated | Red brown |
| Catucaém / louro faia | Clearly demarcated | Brown |
| Cedrinho | Clearly demarcated | Light brown |
| Chengal | Clearly demarcated | Brown |
| Congotali | Clearly demarcated | Red brown |
| Copaiba | Clearly demarcated | Red brown |
| Coula | Clearly demarcated | Red brown |
| Cryptomeria | Clearly demarcated | Pinkish brown |
| Cumaru / Tonka | Clearly demarcated | Red brown |
| Cupiuba | Clearly demarcated | Yellow brown |
| Dabema | Clearly demarcated | Yellow brown |
| Danta | Clearly demarcated | Red brown |
| Difou | Clearly demarcated | Yellow brown |
| Dina | Clearly demarcated | Light red |
| Djedoe | Clearly demarcated | Light brown |
| Douka | Clearly demarcated | Red brown |
| East african bombax | Clearly demarcated | Light brown |
| Ekki | Clearly demarcated | Dark red |
| Essia | Clearly demarcated | Red brown |
| Etimoe | Clearly demarcated | Red brown |
| European Cherry | Clearly demarcated | Orange yellow |
| European Larch | Clearly demarcated | Pinkish brown |
| European Oak | Clearly demarcated | Light brown |
| European Sweet Chestnut | Clearly demarcated | Light yellow |
| Eyoum | Clearly demarcated | Red brown |
| Freijo | Clearly demarcated | Light brown |
| Garapa | Clearly demarcated | Orange yellow |
| Gedu nohor | Clearly demarcated | Red brown |
| Geronggang | Clearly demarcated | Dark red |
| Gheombi | Clearly demarcated | Pinkish brown |
| Gombé rouge | Clearly demarcated | Salmon pink |
| Gombé towé | Clearly demarcated | Salmon pink |
| Grenadillo / Grenadille d’Afrique | Clearly demarcated | Black |
| Guanacaste | Clearly demarcated | Brown |
| Guariuba | Clearly demarcated | Brown |
| Iatandza | Clearly demarcated | Red brown |
| Idéwa | Clearly demarcated | Brown |
| Iroko | Clearly demarcated | Yellow brown |
| Jacareuba | Clearly demarcated | Light brown |
| Kanda brun | Clearly demarcated | Pinkish brown |
| Kanda rose | Clearly demarcated | Brown |
| Keledang | Clearly demarcated | Brown |
| Keranji | Clearly demarcated | Yellow brown |
| Keruing | Clearly demarcated | Red brown |
| Kosipo | Clearly demarcated | Red brown |
| Limbali | Clearly demarcated | Red brown |
| Louro vermelho | Clearly demarcated | Light brown |
| Macacauba | Clearly demarcated | Red brown |
| Macassar Ebony (Ebène Veinée d’Asie) | Clearly demarcated | Dark brown |
| Makoré | Clearly demarcated | Red brown |
| Mambode | Clearly demarcated | Red brown |
| Manchiche | Clearly demarcated | Yellow brown |
| Mandioqueira | Clearly demarcated | Pinkish brown |
| Manil / Manni | Clearly demarcated | Yellow brown |
| Manilkara | Clearly demarcated | Red brown |
| Manniballi | Clearly demarcated | Yellow brown |
| Mansonia | Clearly demarcated | Brown |
| Maritime Pine | Clearly demarcated | Yellow |
| Massaranduba | Clearly demarcated | Red brown |
| Mengkulang | Clearly demarcated | Brown |
| Merbau | Clearly demarcated | Brown |
| Merkus pine | Clearly demarcated | Light brown |
| Moabi | Clearly demarcated | Red brown |
| Mora | Clearly demarcated | Red brown |
| Moral | Clearly demarcated | Brown |
| Mountain Pine (Hooked Pine) | Clearly demarcated | Pinkish brown |
| Mubala | Clearly demarcated | Red brown |
| Muhuhu | Clearly demarcated | Yellow brown |
| Muirapiranga / Bloodwood | Clearly demarcated | Dark red |
| Mukulungu | Clearly demarcated | Red brown |
| Musizi | Clearly demarcated | Brown |
| Mutenye | Clearly demarcated | Brown |
| Niangon | Clearly demarcated | Red brown |
| Niove | Clearly demarcated | Orange brown |
| Nyatoh | Clearly demarcated | Red brown |
| Oboto | Clearly demarcated | Red brown |
| Okan | Clearly demarcated | Red brown |
| Okwen | Clearly demarcated | Light brown |
| Olène | Clearly demarcated | Dark brown |
| Ovangkol | Clearly demarcated | Yellow brown |
| Ovoga | Clearly demarcated | Pinkish white |
| Padauk amboina | Clearly demarcated | Light red |
| Pakuri | Clearly demarcated | Yellow brown |
| Peruvian Walnut | Clearly demarcated | Dark brown |
| Preciosa | Clearly demarcated | Dark brown |
| Pucté | Clearly demarcated | Dark brown |
| Pyinkado | Clearly demarcated | Red brown |
| Red balau | Clearly demarcated | Red brown |
| Red grandis | Clearly demarcated | Red brown |
| Rengas | Clearly demarcated | Red brown |
| Rosewood Para | Clearly demarcated | Pinkish brown |
| Sapucaia | Clearly demarcated | Red brown |
| Scented Guarea (Bossé Clair) | Clearly demarcated | Pinkish brown |
| Scots Pine | Clearly demarcated | Pinkish brown |
| Senegal mahogany | Clearly demarcated | Red brown |
| Sepetir | Clearly demarcated | Light brown |
| Simpoh | Clearly demarcated | Red brown |
| Sonokeling Rosewood | Clearly demarcated | Red brown |
| Suren | Clearly demarcated | Red brown |
| Tali / Missanda | Clearly demarcated | Brown |
| Tamalan Rosewood | Clearly demarcated | Dark red |
| Tamarindo (Groçai-rosa) | Clearly demarcated | Orange brown |
| Tanimbuca | Clearly demarcated | Yellow brown |
| Tasmanian oak | Clearly demarcated | Brown |
| Tatajuba | Clearly demarcated | Yellow brown |
| Tchitola | Clearly demarcated | Red brown |
| Utile | Clearly demarcated | Red brown |
| Vésámbata | Clearly demarcated | Dark brown |
| Vêne | Clearly demarcated | Yellow brown |
| Wacapou | Clearly demarcated | Dark brown |
| Wallaba | Clearly demarcated | Red brown |
| Wamara | Clearly demarcated | Dark brown |
| Wamba | Clearly demarcated | Red brown |
| Wenge | Clearly demarcated | Dark brown |
| Zebrano | Clearly demarcated | Light brown |
| African cordia | Not clearly demarcated | Light brown |
| Agba | Not clearly demarcated | Light brown |
| Andoung | Not clearly demarcated | Pinkish brown |
| Angelim pedra | Not clearly demarcated | Orange yellow |
| Angueuk | Not clearly demarcated | Yellow |
| Aningeria | Not clearly demarcated | Creamy white |
| Bodioa | Not clearly demarcated | Light brown |
| Brazil nut | Not clearly demarcated | Light brown |
| Cedrorana | Not clearly demarcated | Light brown |
| Cerejeira | Not clearly demarcated | Yellow brown |
| Ceylon Satinwood | Not clearly demarcated | Yellow brown |
| Dakama | Not clearly demarcated | Brown |
| Diania | Not clearly demarcated | Light yellow |
| Durian | Not clearly demarcated | Pinkish brown |
| Ekop | Not clearly demarcated | Pinkish brown |
| European Walnut | Not clearly demarcated | Brown |
| Eveuss | Not clearly demarcated | Brown |
| Gerutu | Not clearly demarcated | Light brown |
| Giam | Not clearly demarcated | Yellow brown |
| Gommier | Not clearly demarcated | Pinkish white |
| Haldu | Not clearly demarcated | Yellow |
| Idigbo | Not clearly demarcated | Yellow |
| Igaganga | Not clearly demarcated | Yellow brown |
| Itauba | Not clearly demarcated | Yellow brown |
| Izombe | Not clearly demarcated | Yellow brown |
| Jequitiba | Not clearly demarcated | Light brown |
| Kasai | Not clearly demarcated | Red brown |
| Kauri | Not clearly demarcated | Light yellow |
| Kedondong | Not clearly demarcated | Light brown |
| Kelat | Not clearly demarcated | Brown |
| Landa | Not clearly demarcated | Light brown |
| Lati | Not clearly demarcated | Yellow brown |
| Longui | Not clearly demarcated | Yellow brown |
| Louro branco | Not clearly demarcated | Light brown |
| Macucu de paca | Not clearly demarcated | Yellow brown |
| Mango (Machang) | Not clearly demarcated | Light brown |
| Mecrussé | Not clearly demarcated | Brown |
| Melancieira | Not clearly demarcated | Light yellow |
| Melunak | Not clearly demarcated | Red brown |
| Merawan | Not clearly demarcated | Yellow brown |
| Merpauh | Not clearly demarcated | Light brown |
| Mersawa | Not clearly demarcated | Orange yellow |
| Nieuk | Not clearly demarcated | Pinkish brown |
| Ogea | Not clearly demarcated | Brown |
| Olon | Not clearly demarcated | Light yellow |
| Osanga | Not clearly demarcated | Light brown |
| Ossabel | Not clearly demarcated | Light brown |
| Ossimiale | Not clearly demarcated | Red brown |
| Ossoko | Not clearly demarcated | Brown |
| Owui | Not clearly demarcated | Creamy white |
| Ozigo | Not clearly demarcated | Light brown |
| Ozouga | Not clearly demarcated | Red brown |
| Patula pine | Not clearly demarcated | Creamy white |
| Piquia | Not clearly demarcated | Light brown |
| Piquiarana | Not clearly demarcated | Yellow brown |
| Pulai | Not clearly demarcated | Creamy white |
| Punah | Not clearly demarcated | Light brown |
| Pyinma | Not clearly demarcated | Light brown |
| Quaruba | Not clearly demarcated | Pinkish white |
| Resak | Not clearly demarcated | Red brown |
| Safukala | Not clearly demarcated | Light brown |
| Sandbox | Not clearly demarcated | Creamy white |
| Snakewood | Not clearly demarcated | Orange yellow |
| Sougué | Not clearly demarcated | Brown |
| Sterculia | Not clearly demarcated | Light brown |
| Timborana | Not clearly demarcated | Pinkish brown |
| Uchy | Not clearly demarcated | Pinkish brown |
| White seraya | Not clearly demarcated | Pinkish white |
| White sterculia | Not clearly demarcated | Light yellow |
| Yellow balau | Not clearly demarcated | Yellow brown |
| Yellowheart | Not clearly demarcated | Yellow |
| Yemane | Not clearly demarcated | Light yellow |
| Radiata Pine (European Plantation) | Not clearly to moderately demarcated | Yellow brown |
| Abura | Not demarcated | Light brown |
| African canarium | Not demarcated | Pinkish brown |
| Alstonia | Not demarcated | Creamy white |
| Andok | Not demarcated | Brown |
| Angoa | Not demarcated | Light brown |
| Antiaris | Not demarcated | Light yellow |
| Canon ball | Not demarcated | Light yellow |
| Capomo | Not demarcated | Creamy white |
| Ceiba | Not demarcated | Creamy white |
| Cow tree | Not demarcated | Light brown |
| Curupixa | Not demarcated | Light brown |
| Dalli | Not demarcated | Light brown |
| Dukali / amapa | Not demarcated | Creamy white |
| Ekoune | Not demarcated | Light brown |
| Erimado | Not demarcated | Creamy white |
| European Ash | Not demarcated | Creamy white |
| European Beech | Not demarcated | Light brown |
| European Poplar | Not demarcated | White |
| European Silver Fir | Not demarcated | Creamy white |
| European Spruce | Not demarcated | Creamy white |
| Faveira | Not demarcated | Light brown |
| Goiabao | Not demarcated | Light yellow |
| Ilomba | Not demarcated | Pinkish brown |
| Jacaranda | Not demarcated | Creamy white |
| Jelutong | Not demarcated | Light yellow |
| Kapokier | Not demarcated | Pinkish white |
| Kembang semangkok | Not demarcated | Light yellow |
| Kumbi | Not demarcated | Creamy white |
| Kurokai | Not demarcated | Light brown |
| Magas | Not demarcated | Light brown |
| Maporokon | Not demarcated | Pinkish brown |
| Marupa | Not demarcated | Creamy white |
| Morototo | Not demarcated | Creamy white |
| Mumuli | Not demarcated | Light yellow |
| Odoko | Not demarcated | Light yellow |
| Ohia | Not demarcated | Creamy white |
| Onzabili | Not demarcated | Pinkish white |
| Pashaco / paricá | Not demarcated | Pinkish white |
| Pau marfim | Not demarcated | Creamy white |
| Pau mulato | Not demarcated | Yellow brown |
| Perupok | Not demarcated | Yellow brown |
| Pterygota | Not demarcated | Creamy white |
| Rubberwood | Not demarcated | Creamy white |
| Sesendok | Not demarcated | Creamy white |
| Sumauma | Not demarcated | Creamy white |
| Sycamore Maple (Great Maple) | Not demarcated | White |
| Tauari | Not demarcated | Creamy white |
Data compiled by BigEpoxy from individual CIRAD Tropix 7 technical sheets (average values for mature wood).
Design Choices: Keeping vs. Trimming Sapwood
The presence or absence of clear demarcation shapes several fundamental design decisions during river table layout:
Highlighting High-Contrast Margins
Species with clearly demarcated sapwood—such as African Padauk or Wenge—allow makers to incorporate a distinctive two-tone aesthetic. When building a river table where the natural live edges face inward toward the resin, leaving the sapwood intact creates a bright ribbon separating rich heartwood from tinted, translucent, or deep solid epoxy. This framing accentuates organic live edge curves and produces striking visual contrast.
Achieving Uniform Color Bands
When working with species categorized as not clearly demarcated or not demarcated, such as European Walnut, Agba, or European Beech, the outer edge flows directly into the core timber color. This yields a clean, minimalist design where the heartwood color reaches uninterrupted to the epoxy interface. For builders who prefer this uniform appearance when using clearly demarcated slabs, the pale sapwood band can simply be ripped or planed away prior to casting.
Durability and Edge Preparation
Beyond aesthetics, edge selection impacts preparation steps in the woodshop. In tree biology, sapwood lacks the concentration of extractive compounds that give heartwood its darker coloration and natural resistance to environmental hazards. Consequently, sapwood is qualitatively softer and more susceptible to wood-boring insects, staining fungi, and decay organisms than the heartwood of the same species.
When retaining a demarcated live edge for a river table, makers must inspect the sapwood thoroughly for insect tunnels, loose fibers, or crumbly sections. Any unsound material must be carved or brushed away down to solid, stable wood. Because sapwood tends to be more porous, sealing the live edge with an epoxy primer coat—strictly following the resin manufacturer’s technical data sheet—is essential to prevent trapped air from generating outgassing bubbles along the river channel during the primary pour.
Sources
Published October 31, 2026. Sources are linked in the text.
Header image: original graphic by BigEpoxy.com.
Staff note: In species where CIRAD records sapwood as absent, such as Coconut wood, builders do not need to factor in color contrast lines or density variations between inner and outer zones when truing slab edges for an epoxy pour. (Source: CIRAD Tropix 7 technical sheets (index).)