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Sponges are commonly made from cellulose wood fibers or foamed plastic polymers. Some natural sponges are still sold, but most are now used either as body or facial sponges (bath sponges) or as tools for sponge painting.
The three other categories of available synthetic sponges are: low-density polyether (known as the rainbow packs of non-absorbent sponges), PVA (very dense, highly absorbent material with no visible pores), and polyester.
Polyester sponges are subdivided into a variety of types, some of which are reticulated (artificially broken-in) for ease of use. One type, double-blown polyester, has high water-retention ability approaching or equaling that of PVA sponges, but with visible pores and more diverse uses.
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