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Photopositive

[foh-tuh-poz-i-tiv] /ˌfoʊ təˈpɒz ɪ tɪv/

adjective, Physics.
1.
pertaining to a substance whose conductivity increases upon absorption of electromagnetic radiation.
/ˌfəʊtəʊˈpɒzɪtɪv/
adjective
1.
(physics) (of a material) having an electrical conductivity that increases with increasing illumination

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