Sulfur corrodes many metals through tarnishing. Electrolytically refined pure silver plating is effective at increasing resistance to tarnishing. It usually is found in its native form, lasting indefinitely without oxidization and tarnishing. Coated metallic filaments helps to minimize tarnishing. Defamation means tarnishing the reputation of someone. Hirsch succeeded, severely tarnishing his Frankel's reputation among most concerned. There are various methods to prevent metals from tarnishing. Defamation is tarnishing the reputation of someone; it has two varieties, "slander" and "libel". Falconnier bricks were touted for not tarnishing, trapping dust, or retaining water. The affairs were divulged after his downfall, further tarnishing his image. Several people who had been involved in the so-called "tarnishing" of Mima's reputation are murdered. Also, it has the sought after properties of resistance to tarnishing and knotting. Jack Valenti considered this to be one of the tarnishing marks on the rating system. Nelson got into a violent argument with Herbert Marcuse and accused him of tarnishing Weber. Indian media labels him as a terrorist, further tarnishing his public image.