In simple substances like potassium chloride it seems evident that one kind of dissociation only is possible.
These colour changes are connected with a dissociation of the molecules.
They are yellowish-red solids, which behave as weak bases, their salts undergoing hydrolytic dissociation in aqueous solution.
The dissociation theory was originally suggested by the osmotic pressure relations.
While it seems clear that the conduction in this case is carried on by ions similar to those of solutions, since Faraday's laws apply equally to both, it does not follow necessarily that semi-permanent dissociation is the only way to explain the phenomena.