| The extract from the heartwood is not a dye until it undergoes oxidation into hematein, which is an acid chromogen. |
| It possesses a natural composite quality in the elastic sapwood and the more densely ringed heartwood. |
| In hardwoods especially, the heartwood coloration is preferred and the sometimes lighter sapwood may be considered a defect and discarded. |
| Choose Construction Common or Deck Common redwood, grades with pleasing blends of heartwood and sapwood, for a long-lasting and economical deck. |
| They're a nice, knot-free heartwood, meaning that there's no outer layer of sapwood on it. |
| In the inner heartwood, these bodies were rarefying and cell walls became impregnated by a brown colour. |
