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UV Currency Validation )----(
UV Inspection Applications )
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Floyd's Famous Iced Tea )----(
Kyodai Mahjongg Tilesets )
In decades past, United States currency bills depended on a number of specialized
features to deter counterfeiting. These included highly intricate images, imprinted in
distinctive dark green and black inks, and heavy-weight currency paper with a unique
texture and consistency. A pair of matching serial numbers, and a detailed Treasury
Department seal, are printed in an alternate color. And imbedded within the paper
there are fine fibers of deep red and blue colors, this feature being one of the most
difficult to falsify because the appearance cannot be duplicated by ordinary printing.
All of these features have been continued into modern versions of US currency bills.
However, it has become necessary to incorporate some additional security features
to protect our currency from unauthorized duplication. In 1996, the Treasury Depart-
ment began producing new bills with a number of very sophisticated improvements,
designed to make counterfeiting virtually impossible for even the most determined
and well-funded criminals. Extremely detailed microprinting, color-shifting ink, fine-
line backgrounds, watermarks, and enlarged life-like portraits are now being used.
And imbedded within the paper of each new bill, there is a special security thread.
The imbedded security thread is believed to be the ultimate defensive weapon in the
war against counterfeiting, because it would be incredibly difficult, and extravagantly
expensive, to duplicate its unique features and characteristics. The printed security
thread, which is laminated into the paper, can be seen by holding the bill in front of a
strong source of white light. But it also glows brightly when illuminated by UltraViolet
(UV) light, and this characteristic lends itself to easy detection of counterfeit currency.
Many credit cards and other legal instruments also now incorporate UV security tags.
We offer a variety of powerful UltraViolet flashlights that can be used for this purpose.
See our Inova X5, Inova X1, and Photon Freedom Micro ultraviolet lights. Also check
out the Petra-Tek Multi Light & Laser Pointer, a versatile instrument that's perfect for
casino staff, auctioneers, antique dealers, flea-market vendors, and concessionaires.
Other recent additions to our UltraViolet product lineup include the hefty and versatile
Streamlight TwinTask 3C flashlight and handsome Streamlight Stylus pocket penlight.
Law enforcement personnel will benefit from the QuiqLite XP-440 ID version, a handy
little shirt-pocket clip-on light with both white and UV LEDs set into an articulated arm.
Please note that exposure to UltraViolet radiation is hazardous to both eyes and skin.
Never look directly into the beam of any UltraViolet light source, and do not shine into
the eyes of people or animals. To ensure safety for repeated or long-term uses, wear
protective safety glasses with polycarbonate lenses, these will block the UV radiation.
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The list below describes the appearance of the security threads in
domestic currency bills when they are viewed under ultraviolet light.
Click on a currency value below for an image of the bill and thread.
Information and source images are derived from the United States
Department of the Treasury Bureau of Engraving and Printing site.
$5 - Blue thread to the left of Lincoln's portrait,
imprinted with "USA FIVE" and a flag image.
$10 - Orange thread to the right of Hamilton's portrait,
imprinted with "USA TEN" and a flag image.
$20 - Green thread to the left of Jackson's portrait,
imprinted with "USA TWENTY" and a flag image.
$50 - Yellow thread to the right of Grant's portrait,
imprinted with "USA 50" and a flag image.
$100 - Red thread to the left of Franklin's portrait,
imprinted with "USA 100" but no flag image.
Checking for security threads in United States currency bills is one of the most popular
uses for UltraViolet flashlights, but there are dozens of other applications, and the list is
continuing to grow as new uses are devised. Its effectiveness for validation of currency
bills soon led to the addition of imbedded UV security markings in credit cards, bearer
bonds, and other financial instruments and legal documents. But the scope of applica-
tions for UV flashlights in the forensic sciences and industrial inspection processes has
ballooned explosively in just a few short years, and it seems that there is no end in sight.
Not long ago, UV inspection processes had to be achieved either with bulky and fragile
fluorescent lamps, or with dangerously-hot and uncomfortably-heavy HID (high-intensity-
discharge) lamps. But now we have light-weight flashlights with UltraViolet LED's, and
the easy portability and low cost of these new instruments is leading to extremely rapid
development and instantaneous deployment of new fluorescent inspection applications.
In the sections below, you will find descriptions of a number of popular uses for the new
UltraViolet flashlights. Our most popular UV models are the low-cost Inova X1, and the
small-but-powerful Inova X5. You will find handy UV accessories on our web pages for
each model, including protective yellow glasses and invisible-ink fiber-tip marking pens.
Geosciences & Biosciences -
Some of the earliest applications for UltraViolet illumination arose in the studies of both
mineral and organic substances that fluoresce in the presence of UV radiation. Many
substances can be readily identified by the color and intensity of their fluorescence un-
der various wavelengths of UltraViolet. This has led to numerous technical applications
in chemistry, geology, archaeology, biology (micro to macro) and the medical sciences.
Visual & Performance Arts -
During the 1970's, blacklight posters (with UV fluorescing inks printed onto either black
paper or black velvet) became popular cultural (or counter-cultural) art objects, and they
continue to be popular today, along with blacklight tee-shirts and clothing accessories.
These items were followed by kinetic blacklight art forms such as fluorescent waterfalls
and rotary or reciprocating linear motion scultures. Many visual art blacklight presenta-
tions rely on permanently-mounted fluorescent fixtures. But modern performance artists
now often use light-weight UV flashlights that can be easily carried by hand or attached
to clothing and scenery, for dramatic glowing colors in motion against a black backdrop.
Forensic Investigation -
Popular television shows and movies have established a broad awareness of some of
the more common forensic applications for UV flashlights, including the detection of uro-
genital fluids and exotic chemicals, the use of UV-responsive powders for detection and
comparison of fingerprints, and the marking of currency bills used for ransom payments.
But UV flashlights can also be used to locate glaze defects in antique pottery, to detect
reworks in oil paintings, and to identify forgeries of credit cards or personal credentials.
Fluid Leak Detection -
Many of the fluids used in industrial and commercial mechanical equipment can be inex-
pensively enhanced with fluorescent dyes, so that leaks and their sources can be easily
detected and located under UV exposure. Engine oils, hydraulic fluids, and refrigerants
are popular targets for fluorescent leak detection, and fine dry fluorescent powders can
be used for leak detection in non-wet applications such as vacuum bags and air hoses.
The implementation of UV flashlights for these processes is now growing exponentially.
Surface Inspection -
Metal and concrete surfaces are often subjected to extreme environmental conditions,
especially in marine and industrial and architectural settings. Effective and long-lasting
protection of such critical surfaces is usually required, because replacement will either
be prohibitively expensive or utterly impossible. When applying primer coat and finish
coat protectants, it is essential that they be applied consistently, to prevent early break-
down and potential damage to the underlying surface. As the coatings age, regular in-
spection will help to locate and remedy protection failures before any damage is done.
The addition of UV pigments to marine and industrial coatings greatly enhances these
initial and subsequent inspection tasks, because the fluorescent response seen under
UV illumination will quickly and clearly reveal any thin areas, scratches, or deterioration.
Personal Security -
Personal or company property can be inexpensively marked with a name or code num-
ber or other identifying information, using a fiber pen or rubber stamp with a fluorescent
ink. The markings are invisible under ordinary ambient light, but glow brightly under UV
exposure for positive identification. This method is minimally invasive, and causes less
visual damage than mechanical engraving or adhesive labels, but is reasonably durable.
Wavelength Issues -
Long-term exposures or direct-beam viewing of UV radiation can be hazardous to both
skin and eyes. The majority of UV LED flashlights operate within the range of 365nm to
395nm, a relatively safe region within the near-UltraViolet portion of the electromagnetic
spectrum. But regular users will want to wear protective gloves and UV barrier glasses,
especially if working with the shorter "harder" wavelengths between 365nm and 375nm.
For an eye-safe purple-light alternative to UV inspection, see our Fluorescent Coatings
Inspection page. Inova's X5 Deep Purple flashlight is ASTM E2501-06 compliant, and
it works perfectly with new Sherwin-Williams® OAP (optically active pigment) coatings.
Operating with a median wavelength of 410nm, the X5 Deep Purple does not require a
UV warning label, and may be suitable for other tasks in addition to surface inspections.
Okay, so this isn't about flashlights. Or is it? Flashlights Unlimited is the essential core
of my daily life. And I would not be able to start (much less finish) any given day without
a refreshing glass of iced tea. Other beverages (lowfat milk, fruit juices, canned sodas)
are occasional changes of pace, but sweet iced tea is my ultimate "water of life" (if you
can forgive the blatant Dune reference). My own homemade brew is widely known and
greatly beloved by friends and family. So herein below you will find the "ancient" recipe,
not a secret to be carefully sequestered, but rather an indulgence to be caringly shared.
As it happens, you can brew superb iced tea in a hurry with your everyday coffeemaker,
without the need for a brew pot and a hot stove, and without a pricey separate machine.
Equipment:
1 electric drip coffeemaker
1 plastic one-gallon pitcher
1 long wood stirring spoon
Ingredients:
1 gallon filtered tap water
3 family size premium tea bags
7/8 cup granulated white sugar
1/8 cup granulated dark brown sugar
1 teaspoon wild flower honey (optional)
1 individual size flavored tea bag (optional)
Instructions:
The crucial element for success of this recipe is an electric drip coffeemaker. It makes
the task quick and easy, and seems to provide the perfect temperature for brewing tea.
Use three premium quality family size tea bags. Each major national brand has its own
distinctive flavor, so choose your favorite (if unsure about the best brand, trust your nose
and select the most pleasing aroma). Some store brands are quite excellent, but avoid
the bottom tier of low cost generics (for both tea bags and sugar). Fill the reservoir with
the maximum amount of filtered tap water (usually 10 or 12 cups). Some bottled waters
have added minerals, and those may distort the taste of the finished product. Place the
three tea bags directly into the glass carafe, not into the plastic brew basket. If flavored
tea is desired, place just one small bag of the specialty tea into the plastic brew basket.
Trust me, you will only need one of the single cup size tea bags for flavoring, especially
if the essence is a potent one, such as bergamot or cinnamon & cloves. Push the Start
button and let the coffeemaker do its thing. Meanwhile, rinse the one-gallon pitcher and
pour in both of the sugars (and the optional dollop of honey, if desired). When the brew
cycle has completed, let the tea steep for five to ten minutes (but no longer, because the
flavor will degrade sharply if the tea is over-brewed). Pour the brewed tea slowly into the
pitcher, being sure to hold the carafe lid so that the bags do not fall out, then let the bags
drain completely into the pitcher. Dispose of the spent tea bags, then thoroughly rinse
the carafe before returning it to the coffeemaker. Very gradually add more filtered tap
water to the pitcher, while stirring gently but deeply with the wooden spoon, until it is fully
filled. Cover the pitcher with its plastic lid (or use clingy wrap), and refrigerate until frigid.
Serve over cubed or cracked ice, in tall slender glasses. Garnish with a sprig of garden-
grown mint, or add a slice of freshly cut lemon. Or better yet, try a slice of freshly cut lime
(a delightful variation that I happily discovered some years ago in a Mexican restaurant).
You have probably seen television commercials where the tea drinker goes "aaah". But
as for me, the intense rush from that first chug of fresh iced tea often makes me scream
in ecstasy. On more than one occasion, I have done this in the company of others, whom
I am certain must have thought me to be quite insane. Let them gawk - I love my iced tea!
There is no denying it. There are countless thousands of us in cyberspace, who relax
away some of our leisure hours playing Kyodai
Mahjongg. Regarded by many to be
the most sophisticated and appealing computerized version of the popular tile match-
ing solitaire game, Kyodai Mahjongg was developed by Naoki Haga in 1997. He has
improved and enhanced the game frequently over the past decade, and the latest ver-
sion is truly stunning, revealing levels of finesse and detail that are rarely seen in even
the most expensive software. A variety of beautiful background images are combined
with intricately rendered 3D game tiles and an assortment of hauntingly soothing melo-
dies, to yield an extraordinarily customizable, and highly addictive, gaming experience.
As an early adopter of Kyodai Mahjongg, I was delighted by the feature that allowed a
user to implement custom sets of game tiles (tilesets) suited to personal artistic tastes.
Marc Lesselberg (one of the game's original tile artists) operated a website (offline as
of 2004) that kindly provided a forum for interchange and free distribution of interesting
new tilesets that had been created by adoring users. Many others have taken the task,
and now there are hundreds of tilesets and backgrounds available for Kyodai, and with
themes and styles that are as widely varied as the interests of users that created them.
During 2001, I created ten similar tilesets for Kyodai Mahjongg, all with a crisp techno-
logical appearance, and these were originally released on Marc Lesselberg's website.
I am providing them here as compressed ZIP files in two different source formats. The
set of BMP images is provided for those who may wish to tweak the individual tiles by
using Microsoft Paint or some other bitmap editor, but the expanded files will consume
about two and a half megabytes of disk space. The set of JPG images is provided for
users who like the tiles as they are, and although the downloadable ZIP file is larger, its
extracted source files will take up less than a megabyte of hard disk. Kyodai can read
the extracted image files from either of these two source formats. Download the file of
your choice using one of the links provided below, then unzip that compressed file into
the Kyodai Mahjongg tilesets folder (C:\Program Files\Kyodai Mahjongg 2006\Tilesets
is the default folder name created during installation of the current version of the game).
KyodaiTechnoTilesets-bmp.zip - BMP bitmap image format - 74 KB (75,952 bytes)
KyodaiTechnoTilesets-jpg.zip - JPG photo image format - 691 KB (707,755 bytes)
Either of the two ZIP files will yield the following ten tileset image files upon extraction:
Metal Tech
Metal Text
Brushed Gold
Brushed Silver
Golden Teak
Silver Oak
Midnight Azure
Midnight Scarlet
Neon Ebonite
Neon Graphite
Check them out by clicking above, keep the ones you like, and discard any you don't.
These tilesets are provided completely free of charge and do not require registration,
but of course there is no warranty of suitability or liability for performance whatsoever.
If you do not have the Kyodai Mahjongg game software, you can read all about it and
download the latest shareware or registered versions from the Cyna Games website.
If you like solitaire games and enjoyed Taipei or Shanghai, Kyodai Mahjongg is sure
to keep your downtime pleasurably filled with its wonderful array of sights and sounds.
----(
UV Currency Validation )----(
UV Inspection Applications )
----(
Floyd's Famous Iced Tea )----(
Kyodai Mahjongg Tilesets )
