Wanted: Method to Visualize Bacteria

A method is needed to visually detect the presence of pathogenic bacteria or microbes on human hands regardless of the presence of beneficent micro- organisms and without killing the latter. The solution must be safe for humans and easily applicable by a common user.
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A broad-spectrum biocide is needed for several industrial applications. In addition to being demonstrably effective on a wide variety of common bacteria, it should also deter molds and mildew. The intention is to use the biocide as an additive for plastic objects, apply it to textiles, and use it in water-treatment equipment.
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