I printed a couple of pictures that were shot under "normal" afternoon room lighting. Some of them came out with a grain that became more prominent when I increased the magenta. Other pictures taken on the same roll did not have nearly as much grain, or none noticeable at all.
Here is a scrap print from a project to hopefully show this:
Again, this was taken in the afternoon with relatively strong lighting coming from the window.
What causes grain, and is there any way to control it? Is there a way to increase contrast without making grain more visible? Or, alternatively, is there a way to reduce the appearance of the grain during printing?
My apologies if this question is elementary; I am completely new to black and white photography. Thanks in advance!