Try to tins the tip as it heats If you leave it on too long or run it too hot it will burn off the solder and go black again Don ' t leave your iron running for hours and hours if you are not using it This can make the tip get black-oxide cover Used for soldering at narrow pitches , correction of bridge and drag soldering Lead free paint soldering iron tip , high-temperature resistance , more suitable for high melting point lead free soldering There are total 5 shapes of soldering tips in this set and you can choose the proper for different soldering needs, Manufacturer: Watreketal