Hi Anna- We use color printers for all our printing and not dedicated black and white presses, so it's possible to print non-neutral black and white images.
When printing a new project, always start with single copy proof before placing a larger order. That way you can make sure that the image resolution, color reproduction, trim, paper, binding, etc. meet your expectations.
Our press operators regularly calibrate, maintain and monitor our presses and watch for obvious problems. However, they do not keep the originals at hand for comparison so if there is a problem, please submit a support ticket.