Like the last poster said most labs print on RA4 color paper. RA4 is the process for mini lab paper developing. And you have to adjust every frame to get pure black and white it takes alot of time so most labs will just print it however and you can get green, blue, red, pink, yellow you name it you might get if from trying to print b&w film on color paper. However kodak makes an RA4 black and white paper and if you can find a lab that uses it you can get true black and white prints. You might have to check with labs that do large or commerical work. That paper is higher in cost to labs so if you find one that does use it expect to pay more per print than normal color prints.