A single molecule is not a synthetically manufactured nanomaterial, but what about compounds of 10 or 100 molecules?
How should mixtures of various nanomaterials be treated when the properties of the mixtures do not correspond to the sum of the individual properties of the nanomaterials, i.e. in the presence of synergistic effects?
How should e.g. a colour pigment mixture be treated, which consists of several nano-relevant compounds?