Tintype photography was very popular in the 1860s and 1870s. The photos are taken with shallow depth of field, uneven exposure, and low tonal range. Nowadays people see these pictures very unique and different from how they are now. Tintypes were created with a wet collodion which is a syrupy solution of cellulose nitrate in ether and alcohol. Once its covered in iron plate it will be covered in silver nitrate. they later place this plate in a dark room to bring out the exposure of the photo. Leaving the photo wet or dry will still remain the same results.
The app I used was Tintype. I had made the plate grain up to 60 and 55. For the first photo i made the eye intensity up to 31 and for the second I had it at 0. The depth of field was up to 67 and 44.