Definition(s)
Tarballs
Discrete, and usually pliable, globules of weathered oil, ranging from mostly oil to highly emulsified with varying amount of debris and/or sediment.
NOTE Tarballs may vary in size from millimeters to 20–30 centimeters across, and depending on exactly how “weathered,” or hardened, the outer layer of the tarball is, sheen may or may not be present.
Source: API RP 98, Personal Protective Equipment Selection for Oil Spill Responders, First Edition, August 2013. Global Standards