Before revision: Nobilis colored rings 39 gr of lead acetate 100 ml of distilled water cathode made of platinum or stainless steel (needle), anode nickel-plated or gold-plated copper or brass or polished steel, duration 10 s, distance between cathode and anode 3 mm URL
After revision: Nobilis colored rings 39 gr of lead acetate 100 ml of distilled water cathode made of platinum or stainless steel (needle), anode nickel-plated or gold-plated copper or brass or polished steel, duration 10 s, distance between cathode and anode 3 mm .