Common hazardous ingredients
Acids, bases, heavy metals, various toxic salts.
Potential hazards
Reactive; corrosive; flammable.
Use
Use chemical splash goggles.
Storage
Keep lids of chemicals tightly closed when not in use and store out of reach of small children and away from sources of flames.
Disposal
Best: If the set contains dried out picric acid, avoid transporting it. Contact the explosives disposal team of your local police or fire department.
Second best: Take to a hazardous waste facility or collection event.
Alternative
Choose the least hazardous experimental sets.