Zirconium, metallic, solutions or mixtures thereof, are restricted to a maximum quantity per vehicle^* of 10 gallons or 100 pounds gross weight provided, however, such liquids are inside metal cans with not more than 20 individual glass or porcelain jars, not exceeding two-ounce capacity each. There are no restrictions on the transport of empty containers which last contained zirconium, metallic, solutions or mixtures thereof provided the accompanying shipping papers show that they are drained of the liquid and securely closed.