n. remainder of something after removal of parts or a part; balance
The presence of plastic residue is nothing more than an indication of possible doping.
Sentence in Classic:
Edward was not entirely without hopes of some favourable change in his mother towards him; and on THAT he rested for the residue of their income.
Sense and Sensibility By Jane Austen Context
When she took the paste out to bake it, she left smears of dough sticking to the sides of the measure, put the measure on the shelf behind the stove, and let this residue ferment.