‘Ultra-Fresh Silpure’ uses proprietary nano-technology to produce the ultra-fine silver particles essential to ease of application and long-term protection. The technology is based on the power of silver to fight bacteria. It, thus fights contamination and maintain freshness.
Silver is less toxic than most metals which have similar anti-microbial effects, but I'm still wary. Note this story:
Washington -- To find out if the tiniest airborne particles pose a health risk, University of Rochester Medical Center scientists have shown that when rats breathe in nano-sized materials, the particles quickly follow an efficient path from the nose to several brain regions.
That's nothing to sneeze at.