Fingerprinting is clearly associated with only two things - the work of the police and biometric sensors. Moreover, if a law-abiding citizen uses his own fingerprints, then someone else's biometric data may be required, most likely, to the violator of the law. What is the fingerprint manufacturing process?
Instruction manual
1
The first step is to get a quality sample. This means that the fingerprint must be clear, complete, not smeared. It is not possible to get such a sample from every surface. Smooth-coated surfaces are best suited, leaving prints on them best.
2
When the sample is received, an imprint is required. There are several ways to do this. The first method has been used for a very long time: graphite dust is applied to the sample, the excess is brushed off with a soft brush. Everything, the imprint is ready. You can fix the fingerprint using adhesive tape (adhesive tape).
3
The second option involves the use of "Superglue". It is necessary to pour glue into a small container and hold a sample over it. After some time, the glue vapor will settle on the lines of the pattern and give the necessary imprint.
4
Next, the fingerprint is digitized. Using a high-quality camera, the image of the fingerprint is taken and transferred to a digital storage medium for subsequent work with it in a graphical editor. In the program for working with graphics, it is necessary to achieve a perfectly clear black and white picture corresponding to the original size. The resulting figure must be inverted.
5
When the drawing is completely ready, it is transferred to a copper plate. The plate is etched, from which protrusions corresponding to the papillary pattern are formed on it.
6
After that, silicone is poured onto the plate with the transferred image, which fills the recesses and protrusions. At this stage, a repeated inversion of the imprint occurs - the depressions turn on the surface of the silicone into protrusions and vice versa. For this, it was necessary to invert the drawing in a graphical editor.
7
In the process of pouring silicone, air bubbles sometimes remain, which can ruin the whole picture. Using an ordinary syringe, you can create a semblance of a vacuum chamber: put silicone into the syringe and, having closed the needle hole with your finger, pull the piston up a little.
8
You can also apply a very thin layer of silicone to copper, wait until it dries, and apply the next one. In conclusion, it remains only to dry the silicone and remove the finished print from the mold.
