| http://www.w3.org/ns/prov#value | - In general, there may be at least three chemical sources capable of producing an effect similar to that of the B??lmez faces: (1) Products that affect the chemical structure of the cement which include some oxidizing agents and several acids (all types of cement are of alkaline nature and therefore easily attacked by acids); (2) products that leave the cement intact but change their chemical struc
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