Black/White or color can you change?

Just curious, if you're not sure about color, or how much you want, can any tattoo be left just black and white? Can you add color later or does the shading differ if your not doing color? I'm torn tring to decide on color or not?

That would be black and gray dear and yes you can leave the color out and put it in later...didja go see your artist about your half sleeve?.....TAz

YES! Black and...grey. (I thought back and white sounded weird?). I'm suppose to now go this afternoon if my husband gets home in time to watch kidlet. . Hey, can I email his web page? I'd love an opinion?