Black hooch is NOT an indication that your starter has died or has gone bad. It's normal to see this on starters that get forgotten at the back of the refrigerator. If there is a lot of black liquid then drain it off. Then discard half the starter and feed your starter and get it doubling in size every 6 to 12 hours (usually only takes a week to revive it). Put it back in the fridge, just remember to feed it once a week.