I have used this in my biology class with freshmen and my kids and it works. We tested different substances as well as crushed leaves and this separates the different pigments quite well.
π¬ Precision Density Cube Set - Metals with 10mm Sides
3 Review
π Cylindrical Metal Length and Diameter
Density Cubes Metals 20Mm Sides
π Density Cube Block for Specimen Analysis
π§ Enhancing Anatomy Learning: Portable & Detachable Enlarged Anatomical Education Aid for Students
π Laminated Anatomical Pack for Skeleton Ligaments
KISSTAKER Removable Heart Visceral Educational Parts
Anatomical Chart of Spinal Nerves and Dermatomes