Petri dishes were prepared with an agar-broth mixture. Six different solutions, water, vinegar, 0.5 normal HCl, 1 normal HCl, pure lemon juice, and lemon juice diluted with an equal part of water, were prepared, and their pH measured.
Pieces of chicken, each approximately 1 cubic centimeter, were placed in each liquid for two minutes.
The chicken pieces were then removed, and each one rubbed over the surface of a Petri dish. Other pieces of chicken not dipped in any solution, were also rubbed against the surfaces of five Petri dishes, for comparison.
The Petri dishes were then sealed. After four days, the lids were removed from the Petri dishes, and the percent of surface area covered in visible bacteria colonies was measured.