To track the experiment, students marked 1,500 clams with bright pink and orange nail polish before placing them across several underwater sites. Part of that includes keeping track of all their clams — and they’re using bright pink and orange nail polish to do it. Nail polish as an important toolWhat they're saying:But keeping track of 1,500 clams underwater can be tricky. That’s where the bright pink and orange nail polish comes in. "If [the nail polish] got inside where the clam tissue is, it could be problematic, but they are closed up and sealed.