[matthew fuller]

I haven’t heard of this. Here’s something else that might be of interest-

http://www.coppertouchsurfaces.org/antimicrobial/

[CutePuppy]

It's well known that Copper and Silver have antimicrobial properties (in particular, silver is widely used in dressings of wounds when antibiotics are counter-indicated or not effective) but their uses have certain side effects and are limited mostly to contact surface of skin and wound, and they are expensive, while this chestnut extract could be synthesized and cheaply made, and safely used with disinfectants as well as applied directly to patients.