Diospyros virginiana In respect to the power of making heartwood, the persimmon rarely develops any heartwood until it is nearly one hundred years old. This heartwood is extremely close-grained and almost black, resembling ebony (of which it is a true variety). It is a common misconception persimmon fruit needs frost to ripen and soften, called bletting. Some, such as the early-ripening varieties "pieper" and "NC21"(also known as "supersweet"), easily lose astringency and become completely free of it when slightly soft at the touch—these are then very sweet, even in the British climate. On the other hand, some varieties (like the very large
Ebony prized for its luxuriant, multi-colored wood grain. Mauritius ebony, "Diospyros tessellaria", was largely exploited by the Dutch in the 17th century. Some species in the genus "Diospyros" yield an ebony with similar physical properties, but striped rather than evenly black ("Diospyros ebenum"). Ebony has a long history of use, with carved pieces having been found in Ancient Egyptian tombs. By the end of the 16th century, fine cabinets for the luxury trade were made of ebony in Antwerp. The wood's dense hardness lent itself to refined moldings framing finely detailed pictorial panels with carving in very low relief (bas-relief), usually