Half a croissant, on a plate, with a sign in front of it saying '50c'
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Color Changing Hand Sanitizer

Bright green, red or other color goes away when the active antiseptic evaporates.
  [vote for,

When you're out in public, this would go along with wearing a mask. You and others would know that your hands are loaded virus killing machines as long as the coloring remains.
doctorremulac3, Apr 26 2020

Anti-microbial surface coating supposedly lasts 90 days https://www.ust.hk/...ht-against-covid-19
Claims to be usable in hand sanitizer [kdf, Apr 29 2020]

Polychlorinated biphenyl https://en.wikipedi...hlorinated_biphenyl
Very persistent; not very nice at all. Simple chlorophenols are a bit safer. [8th of 7, Apr 29 2020]


       The alcohol-based ones are inactive as soon as they're dry. There's no residual effect.   

       Surfaces are disinfected, but are immediately susceptible to recontamination.
8th of 7, Apr 26 2020

       It would have to be something whose sanitizing effect lasts longer than alcohol and has indicating color linked to it.
doctorremulac3, Apr 26 2020

       Chlorophenols, then, although you risk dermatitis and other undesirable effects from long-term exposure.
8th of 7, Apr 26 2020

       (link from ust.hk) of interest only because they claim their anti-microbial coating can be used in hand sanitizer and lasts much longer than the time it take for the carrier to evaporate. Not sure I believe all of their claims, but this addresses 8th's and dr3's concern of the other day.
kdf, Apr 29 2020

       90 days? What's it contain? Polonium?   

       Thanks for the link though.
doctorremulac3, Apr 29 2020

       I am skeptical as well. I could believe "all-day" protection for a hand sanitizer (more like a lotion or barrier cream, I guess), as long as nothing else washed it off. On other kinds of surfaces, maybe a few days or weeks. At one point in the article they mentioned a few weeks protection on curtains and other surfaces - but then make the leap to claim 90 days? Hmmm...
kdf, Apr 29 2020

       I'd read the small print after the asterisk of death. *   

       * Note: Product claims might not necessarily apply to THIS particular product. The maker claims total immunity from any laws regarding false claims and the user completely agrees to these terms by buying the product and, just due to having read this,agrees to never sue for any reason. Too late, you read it, NO TAG-BACKS! In fact, these words form a kind of written "cloak of invulnerability" that no force on Earth can penetrate.
doctorremulac3, Apr 29 2020

       Good job we're here, then.   

       Chlorophenols are very persistent (vidè problems with PCBs) but the problem would be unintentional mechanical removal on the very surfaces where it's most needed.
8th of 7, Apr 29 2020


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