I've hit the wall in terms of the internet.
Do you understand german? In this case http://genwiki.genealogy.net/IR_50 might be of interest for you, maybe also this book, especially Teil IV, Band 1:http://genwiki.genealogy.net/Milit%C3%A4r/Literatur/Handbuch_der_Verb%C3%A4nde_und_Truppen_des_deutschen_Heeres_1914_bis_1918
If not, a short overview:
It was founded 5.5.1860 as 10. kombiniertes Infanterie-Regiment (10. (prussian) combined Infantry Regiment) and was stationed in Breslau (Wroclav) and Öls (Olesnica). 4.7.1860 it was renamed to 3. Niederschlesisches Infanterie-Regiment Nr. 50 (3. Lower Silesian Infantery Regiment Nr. 50 [meaning it was the 50. prussian Infantry Regiment]).
In 1866 it was stationed in Posen (Poznan), 1871 in Rawitsch, Lissa and until 1881 also Ostrowo.
It fought as well in 1864 against Danmark as 1866 against Austria and 1870/71 against France.
In WW1 it was part of 10. Infantry Division.
This is the Uniform: https://www.flickr.com/photos/ahand_grafx/38355685821/in/photostream/ Cuffs were red with white piping, shoulder marks yellow with red numerals.
This is the field uniform: https://www.flickr.com/photos/113027523@N07/11889379105/
I hope I could help you.