| http://www.w3.org/ns/prov#value | - This may be accomplished by treating it with a size, such as glue or casein, and a plasticizer, such as glycerine, or by treating it with a dilute solution of sodium silicate in water and drying it while in expanded condition, or by coating it with a plastic substance such as varnish, shellac, phenol condensation resin, etc., and expanding it while the substance is plastic and permitting the latte
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