“The free Project Pack contains the essential ingredients needed to conduct your survey, but you also have the option of printing the downloadable materials, and sourcing your own mustard and vinegar. Any regular vinegar or powdered mustard is fine - just remember to use the same products throughout your survey. You will need 15ml of vinegar and 30g of powdered mustard - one heaped tablespoon (about 15g) of mustard powder per 500ml of water.”
Earthworm Watch is a collaboration between Earthwatch Institute (Europe) and the Natural History Museum in London