Don;t worry about having black rodinal, it'll work as fresh.
I found a bottle with a little in it in the back of one of my shelves (about 2yr old) and it worked fine, I mixed the left over with a new bottle.
Sometimes you can see a "sludge" at the bottom of the rodinal bottles, don;t worry about it. From my understandig Rodinal is a saturated solution of p-aminophenyl so having some of it settling shoulnd't be bad.
Originally Posted by Steve Roberts