# Precipitins

Identification of human vs. animal blood, stains through chemical tests - scientists, labs, chemists, rabbits, experiments, blood, nurses, lab technicians, microscopes, test tubes, etc.

- Kind: Educational
- Year: 1930
- Genres: Education, Science, Industrial and advertising
- Archive: [Internet Archive](https://archive.org/details/preciptins)
- Licence or status: [Public domain (Creative Commons dedication)](http://creativecommons.org/licenses/publicdomain/) (as the archive states it)
- Who can watch: Teens profiles and older (the archive gives no rating; placed by Invisible Network from its collection and subjects)

[Watch now](https://invisiblenetwork.ai/watch/archive/ia/preciptins?play=1)