Key fact An impure substance is a type of mixture, so melting points can be used to find out if a substance is pure or impure. Impure substances tend to have a slightly lower melting point than ...

Results: The definition of a placebo given by the majority of the PCPs in our study was one which actually only describes pure placebos. This definition, combined with the fact that most impure ...

In order to evaluate these qualitative aspects of placebo use, it is crucial to distinguish between pure placebos and impure placebos. [8] Pure placebos are substances or forms of treatment that ...