1. Does "radiolucent" mean it appears white on radiographs? 2. Does "radiopaque" mean it appears black on radiographs? 3. If something is radiolucent, is it also white (or yellowish in the case of cholesterol stones) in the body? 4. If something is radiopaque (like pigment stones), is it black (or dark green) in the body? I've been stumped by this concept for several months now and keep confusing it. I asked last year's step 1 MVP at my school and he even seemed a bit confused. I used to have a mnemonic but I can't remember what it was... BOWL, WOBL, BLOW???? Thanks in advance.