Conducting paper or carbonized paper can be made at home for undergraduate EM lab experiments, and alternatives like conducting inks are also viable. Silver inks have been successfully used for mapping conductor shapes in integrated circuit design, though their accuracy can vary based on the application method. The discussion highlights the importance of understanding the limitations of these materials in practical use. Rigging up an electrolytic tank is noted as more complex, with a suggestion that familiarity with the setup is crucial for success. Overall, experimenting with these materials can enhance learning in electromagnetic field mapping.