June 07, 2020, 03:05:47 AM
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### Topic: Covid: Disinfect Money  (Read 222 times)

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#### Enthalpy

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##### Covid: Disinfect Money
« on: May 06, 2020, 05:45:32 PM »
Hi everyone !

In shops, one remaining Covid contamination path is money. An answer is to allege that money doesn't host the virus, I read that. Or we can try to tackle the problem.

UV light is known to destroy virusses, including Sars-Cov2. UV LED are available for near-ultraviolet Hg wavelengths, compact, reliable, efficient. This could irradiate the money between the cashier's and the customer's hands, in both directions.

The rest is mechanical design, still imprecise. The apparatus must stop the UV from exiting but irradiate both sides of banknotes and coins.

Both users could introduce the money at the top, say between a pair motorised soft rolls, and grasp it at the bottom, after an other pair of rolls. UV between the pairs of rolls would be blocked by the rolls. Nice for banknotes, but the coins would fall at once. It also needs a soft material that survives UV. This shape has the smallest footprint.

Or a platter would tun slowly. The customer has a sector to introduce and extract money, the cashier has an other sector, and the two sectors in between irradiate the money under a cover. Silica and variants make the platter transparent to UV.

Maybe banknotes and coins should have different paths. Possibly the soft rolls for banknotes and the platter for coins.

The apparatus must be easy to open, and opening must halt the UV emission. Fluorescent surroundings would reveal any UV leak.

Marc Schaefer, aka Enthalpy

#### Borek

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##### Re: Covid: Disinfect Money
« Reply #1 on: May 06, 2020, 06:47:04 PM »
Switching to contactless CC payments sounds easier and doesn't require extra hardware that will be thrown away after the situation gets back under control.

Can't remember when it was when I last used cash.
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#### Enthalpy

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##### Re: Covid: Disinfect Money
« Reply #2 on: May 07, 2020, 12:56:18 PM »
Arguments against contactless:
- Germans don't want.
- I don't want. It tells where I am, what I do. It may help forge my bank card.
- I would cost me fees for each single payment.

#### wildfyr

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##### Re: Covid: Disinfect Money
« Reply #3 on: May 08, 2020, 03:43:52 PM »
Disinfecting cash is so much harder than using contactless payments, or even just disinfecting ordinary credit cards. A simple wipe with alcohol disinfects a card. Been doing it for weeks. CC swipe machines are very high contact points. You gonna make a billion of these money disinfection machines and distribute world wide? Or use the hundreds of millions of contactless credit card readers already out there and paid for. In German big cities I didn't have too much trouble using a card. Only in small places. In many countries card use is near universal.

I got $120 cash out of the bank 7 weeks ago. Have not spent a cent. Everything done on card, or contactless payment on my phone or an app. I bet I spend under$300 in physical cash per year these days.

#1 and 2 "I/Germans don't want" is a terrible reason, or rather not one at all. For location, Do you carry a smartphone? Most people do. Your location is known if a government party cares to know. For forging bank card, most banks and ALL credit cards will cover transactions made with stolen card info. Its the law in the US I think. Other countries should adopt this, its part and parcel of broad card use. Europe is the place that started using chipped cards and increased card security anyways.

#3 at least in America credit card fees are assumed by the store. Of course this is ultimately passed to consumer by price increases.

What sounds more important to you:

"I/Germans don't want because stubborn, and location privacy (when 99% of people have smartphones in pocket anyways)" or "public health during pandemic." Its the old "security vs freedom" debate.

Lastly, UV is not the way to disinfect paper cash or any porous material. Too many micro/nanocrevices won't be irradiated. Aerosolized antimicrobials would be the way to go.

#### Enthalpy

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##### Re: Covid: Disinfect Money
« Reply #4 on: May 08, 2020, 08:14:14 PM »
Whatever your opinion or mine about using contactless payment, the Germans won't. Same in many other countries. And I carry no smartphone, in fact no cellular phone at all, location being only one of the issues.

I'm confident that UV reaches the depth of a banknote. You can see through a banknote.