Money Laundering

by on January 24, 2014 at 12:56 pm in Economics, Science | Permalink

From a new paper that caught my eye in the journal Industrial and Engineering Chemistry Research:

With nearly 150 billion new banknotes being manufactured and printed every year around the world, the replacing of unfit currency is approaching $10 billion annually. In addition, central banks must also deal with the environmental challenge of annually disposing of nearly 150,000 tons worth of notes unfit for recirculation. Seminal work by the De Nederlandsche Bank (DNB) has identified that soiling is primarily a yellowing of the notes due to the accumulation of oxidized sebum. We show that supercritical CO2 (SCCO2) can be effectively utilized to remove sebum and other oils and contaminants, including common bacterial colonies, from both paper and polymer banknotes without destroying the costly and sophisticated security features employed by central banks to prevent counterfeiting. SCCO2 cleaning at 60°C and 5000 psi was shown to be effective in cleaning conventional straps of 100 banknotes, extracting nearly 4% of the initial strap weight. Measurements of note soiling distributions on a banknote sorting machine running at 10 banknotes per second showed a significant shift in soiling levels after cleaning, supporting the claim that processing of SCCO2-cleaned notes would result in significantly fewer notes being classified as unfit due to soiling and shredded.

Hat tip: Fast Company.

chuck martel January 24, 2014 at 1:06 pm

I just wash mine in Rolling Rock.

Anon January 24, 2014 at 2:24 pm
Rahul January 24, 2014 at 2:50 pm

Umm…“extracting nearly 4% of the initial strap weight.” seems a fairly crude metric.

I can think of ways to extract close to 100% of initial strap weight. It’s what you extract that matters.

Curt F. January 24, 2014 at 6:39 pm

I have never seen bitcoins turn yellow from oxidized sebum. Just sayin’.

Guest January 25, 2014 at 11:10 am

Right, because those smartphones and ASICs will last forever…

JWatts January 24, 2014 at 6:43 pm

“due to the accumulation of oxidized sebum”

So 4% of money by weight is scummy skin oil. Umm.. yuck.

Thor January 24, 2014 at 6:54 pm

Of course, 4% of anything is scummy skin oil.

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