This EASY to use genuine GTE JSP Silver appraisal test kit is great kit to use to determine the value and authenticity of your jewelry, scrap, and much more! Simply scratch the test stone with your jewelry and apply a drop of the acid to the stone and watch the results appear! (Stone sold separately) This 4 piece listing includes: (BUNDLE SAVE$$) - (2) JSP Silver Testing Acid Solution (0.5 oz) - (1) GTE Acid Neutralizing Solution (0.5 oz) - Used to clean stone between each use and prevent contamination. - (1) Easy to follow testing instruction booklet with color chart! If you have any further questions, please feel free to contact us. We look forward to serving you in the future.