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  1. In flotation, a chemical added to the pulp to increase the floatability of a mineral in a froth or to refloat a depressed (sunk) mineral. Also called activating reagent. CTD
  2. A reagent that affects the surface of minerals in such a way that it is easy for the collector atoms to become attached. It has the opposite effect of a depressor. CF: depressor
  3. A substance that is required in trace quantities to impart luminescence to certain crystals. CCD, 2
  4. Ions that are photon emitters. Van Vlack
  5. Any agent that causes activation. See also: activating agent Bennett
    Source: Dictionary of Mining, Mineral, and Related Terms

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