Which action would NOT constitute good laboratory practice for chemical waste disposal?

Burning flammable solvents in large metal containers does not align with good laboratory practice for chemical waste disposal. This method poses significant safety hazards, including the risk of uncontrolled fires, toxic smoke, and environmental contamination. Proper disposal of flammable solvents requires adherence to regulations and guidelines, which typically advocate for safe containment and disposal through designated channels rather than incineration in potentially dangerous conditions.

In contrast, the other actions mentioned—disposing of acid waste in designated containers, using appropriate hazardous waste bins, and labeling waste containers clearly—are all practices that promote safe handling, storage, and disposal of hazardous materials, ensuring compliance with safety regulations and minimizing risk to personnel and the environment.