Only is DirtFarmer correct but add to the nature of color from the source of light.
I am a child of the film age. Alas the expense of film and darkroom is greater then any simple digital configuration.
DirtFarmer wrote:
All B/W is not the same.
In digital, B/W is produced by taking the R, G, and B luminance values and combining them in some way. You can add them, average them, or do a weighted average. Every method will look different from another.
Similarly, in B/W film, the resulting image will depend on the sensitivity of the film to various colors. There will be at least as many different results as there are different kinds of B/W film, and probably even variations due to development.