Are bacteria good, bad, or both? How clean are your hands? Discover how well your (homemade) soap works by testing how many bacteria are still on your hands after washing. Start your experiment with the instructions in this download:
A4 Instruction leaflets
Download the DIY instructions above. Print these double-sided (always the most sustainable choice) on plain paper. Now fold the paper twice, leading to a small booklet with the title in front. Ready!