When it comes to finding synonyms for the phrase "solution of very pure solids," there are a few options to consider. One possibility is to use the term "crystalline solution," which refers to a liquid in which a solid substance is dissolved in such a way that it forms a clear and pure crystal structure. Another option is to use the term "homogeneous solution," which refers to a well-mixed solution in which the solid and liquid components are evenly distributed throughout. Alternatively, one could use the term "saturated solution" or "supersaturated solution" to describe a solution in which the concentration of the solid is at its maximum level of solubility.