This type of fingerprint, which is not readily visible, consists of impressions of the ridges of the fingers, transferred to other surfaces by sweat on the ridges of the fingers or because the fingers carry residue of oil, blood, dirt, or another substance. these prints are referred to as:

Latent fingerprints is the correct answer.

In Investigation, latent fingerprints, also known as chance impressions, are invisible patterns made by fingerprints that are left at a crime scene or on objects involved in the crime. These patterns are not visible to the naked eye, and because of that they are analyzed through chemical or physical methods (such as dusting techniques and lasers) by latent fingerprint experts.  

unknown. best bet to watch it is at kissanime (a lot of popups and has ads and has potential to be a virus not recommended) or crunchyroll (recommended but has ads and has no popups). you will have to wait. i really want netflix to give the other seasons.