A bar soap comprising a pyrithione source, a soap surfactant, and a pH adjusting agent selected from a group consisting of ammonia solution, triethanolamine, diethanolamine, monoethanolamine, potassium hydroxide, sodium hydroxide, soluble carbonate salts, and combinations thereof, wherein the bar soap attains a pH of greater than or equal to 10. Each of the first and second permanent magnets has at least two associated poles. Also provided is a coating composition containing such a synergistic antimicrobial composition, and a dry film made from such a coating composition. The silicon film is etched so as to leave a portion of the silicon film that is disposed on the bottom portion with the trench insulating film being interposed therebetween.