 | How to obtain good finger prints |  |
HOW TO DEVELOP AN INVISIBLE FINGER-PRINT IMPRESSION.
If it is suspected that the impression is on a dark surface, glass, or metal, sprinkle it with gray powder or aluminum dust and then brush off with a camel-hair brush. This should bring out the print very clearly. Should the surface be white in color, graphite or powdered charcoal may be used.
If a camel-hair brush is not handy the powder may be blown off which will bring the same result as if brushed off.
Gray powder is composed of mercury and chalk.
In robbery cases this information should be very useful.
L. C. PALMER, Chief of Bureau.
| How to obtain good finger prints | |