| http://www.w3.org/ns/prov#value | - In another preferred embodiment, the colors of the two or more quantum dots combine to produce a color, which is different from either of the colors from which it is derived. [0210] In presently preferred embodiments, the target is a member selected from the group consisting of acids, bases, organic ions, inorganic ions, pharmaceuticals, herbicides, pesticides, chemical warfare agents, organisms,
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