Evening star. [volume] (Washington, D.C.) 1854-1972, 1930-06-01

stuff the light will identify its original district
and simplify the hunt Of Government investiga-
tors for the source of the leak.
OWE have examined samples of = ,Otch
whisky sent by Government chemists
who were certain it was smuggled stuff and not
bootleg because they could not find any traces
Of dethyl thallate, the substance which the
Government regulations require to be added to
commercial alcohol to hamper redistribution
The black light has demonstrated that the
stuff was washed and that traces of the diethyl
thallete still remained.
Perfume manufacturers who wish TO pre-
vent INSCRIPTIONS manufacturers from refillng
and relabeling their perfumes can protect their
products by adding harmless and special coloTS
to their perfumes which will identify the orig
inal perfume no matter where it is found
Black light is light of truth, and we
have only just begun to realize its possibilities.
Under the name Of ultraviolet radiations it
is well known. I suppose everybody understands
that ultraviolet radiations the invisible
light waves just beyond the visible violet In thu
spectrum.
II do not know why it is that this narrcw
band of light waves makes the invisible wish e,
separates the true from the false and allows to
extend the power of the eye into an impalpa lie
is still mystery, but they have enormous o.
tentialities for human good and social welfare.
I'm the field of food substitution or adultera-
ton black light can be used for the protection
of public health and the public pocketbook.
The invisible rays easily discriminate between
olive oil and mineral oils, they reveal the diff
ference between pure and costly almond paste
and almond paste which has been 'sophisti-
Gated with sugar. There is no harm in the
sugar, but the practice is fraud.
cI1nuJc no oV16 f1a iVN
pearls and diamonds, and in the field of silk
production it is my guess that the rays will be
used to spot shaded and unshaded silk fiber
which takes dye evenly and that which doesn't.
thereby saving the silk industry millions Of
dollars annually"
DIR. Goodman picked up handful of cocoons.
They were all the same degree of yellownesS in
ordinary light But when the violet glow
turned upon the cocoons, specks and bands
appeared.
Investigation of silk is not in my field said
DR.. Goodman, but the appearance of these
light variations some of the cocoons prob
ably relates to some quality of the thread, and
1t is bound to have valuable commercial impli-
cations
TROY collar manufacturers have been here to
find out what the light teach them about
bleached and unbeached linen, and it has been
demonstrated that it will disclose when the
fabric is being beached too far.
I'VE have demonstrated that the light has
diagnoStic value in diseases of the skin. It
will show ailments at the roots of the hair when
there is nothing visible to the eye. In many
cases where the microscope findings of disease
have been made with the utmost difficulty,
black light has given an almost instantaneous
diagnosis of the type of pathology"
In discussing the findings of this light DR..
Goodman showed how permanent hair wave
can be detected and even the approximate
length of time since the last visit to the barber.
The light does this stunt by revealing surface
markings on the skin hair which the naked
eye cannot see
IF the girl friend around bareheaded
in the sun on her vacation last Summer but has
worn her hat regularly since, the light may dis
close the traces of the sun and give basis for
estimating how long ago it was made. Heat Of
the sun of BARRIERS instrument turns the hair
. lighter golden shade
IF to the Bertillon measurements of crim-
inals are added the revelations of the ray, there
is a means of identifying the malefactor even
If he has changed his habits
Since the widespread Of radio" DR..
Goodman went on, people understand the 1i-
vision Of waves Of light and electricity into
meters. The sun sends out its rays in units
which measure less than one-milhOnth Of .
meter. Such q unit in the metric system -
called the AngStrom unit"
(Copyright 1882