You can explore the shades using a printed or hand-painted color chart. The printed color chart is free. It helps you get an idea of the selection, but due to printing techniques, its colors do not perfectly match the final painted surface.
The hand-painted color chart costs 54 euros and includes all 36 shades. The samples are painted with real clay paint on A6-sized rag paper. They show you both the shade and the texture of the paint surface better than the printed chart. Evaluate the shade in the room and lighting where you plan to paint.