I'd like to convert everything in my image to be pure black (on a white background). I've been using

Is this the correct way of making my picture strictly black and white or is there a better more "precise" method?
STEPS FOR EVERYTHING BLACK:
>Select all my objects
>Object Menu
>Fill and Stroke
>select Fill tab >select RGB
>R=0 G=0 B=0 .... and everything seems to go pitch black
Thanks,
Michelle