This durable white paste flux is a must-have for silversmiths as it can withstand prolonged heating without breaking down. It comes with a convenient brush built into the cap, making it easy to apply in precise locations. It is effective for soldering or brazing non-ferrous metals such as gold, silver, brass, and copper, and can withstand temperatures ranging from 1,100°F to 1,600°F (593°C to 871°C).