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How do we know if a newly developed chemical compound has any taste or is tasteless?

I was reading this about polystyrene, which says: "Polystyrene is an odorless, tasteless, rigid thermoplastic", and got hung up on "tasteless". I searched Chemistry.SE for "tasteless" and found this ...
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Don_S
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Can plastic leak into water from a HDPE "2" plastic container at room temperature?

Here in USA supermarkets often sell water in plastic 1 gallon jugs. These jugs seem to all be stamped with the text "HDPE" (meaning that the material is High-density polyethylene) and a resin number ...
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