Black Patina for Zinc channel will not wash off after applying by dipping, flooding, submerging for at least 40 seconds on each end. Then lay your project flat and continue to use your regular patina for lead or solder on both sides, then wash in cold water only. Then dry and wax. This is a 32oz Studio Size bottle. Now all will match when you patina the zinc channel and solder/lead instead of that uneven color using that product that does not work? Stays Black does what the name says! Stays Black may be used many times over. Now the all new Dipping Tray called 1EZ Dip for dipping into the patina.