@ dingbat again
I used to use inks a lot, not I go with washes...
if you DO use inks though, just like the guy before water them down, if you use the wash instead no need to worry about watering down, its watered down enough
an ink is stronger...and more potent if you will, it will darken the recesses but it might also darken the rest of the model
a wash will also darken the recesses, which is what you want, and it'll generally keep the rest of the armor at its original tone (it may darken or change the color a little, but just a little, not as much as an ink)