Paint Samples?
Answers:
Paint will always look different on your walls than it does on the chip. I suggest buying a quart and painting several large swatches on the walls you wish to cover. Watch it throughout the day and evening, you'll be surprised how natural light alone will change the hue. Even the type of lighting you have in the room artificially, the wood tones, the floor treatment and large upholstered items will make it look different.
Other answers:
darker
darker
It will probably look darker just because any colour over a large surface looks bolder and darker than on a small chip.
However, your lighting and room shape can really affect that so there's no definite way to predict it. My suggestion is that you buy a small sampler of the paint (most stores will sell you a $5 quantity of any colour) and paint one wall to see if you like it.
it will look exactly like the paint sample if you apply it correctly. that is, primer first so you can't see anything underneath. and you look at the sample in the same light that it will be under......if you have fluorescents in your bathroom - look at it under fluorescent lighting.
Color is a funny thing. It looks great on the paint chip and then you buy it and apply it to your walls and it looks horrible!
Color affects color! If you room is already dark, then it will be darker. If your room is bright with a lot of natural light you will be ok with any dark color.
Benjamin Moore has on their website the personal color viewer. You can paint a room with their colors and they have so many colors, and get idea how that color will look on your walls. Keep in mind its only an idea, but it is pretty accurate.
I will post the link below and you can try it. Its pretty user friendly. Good luck with your project.