<http://schema.org/description>
"Electroless black nickel-phosphorus plating is an advanced electroless nickel plating process formulated to deposit a black finish when processed through an oxidizing acid solution."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.pfonline.com/articles/investigation-of-the-blackening-process-of-electroless-nickel-phosphorous-coatings-and-their-properties>