I don't have any first hand experience with that but I KNOW that I read it here that working strenth Rodinal has a VERY short shelf life. Dump it! You only need a few cc's to make new working strength developer, right?
“Believe nothing, no matter where you read it or who has said it, not even if I have said it, unless it agrees with your own reason and your own common sense.” – quote
I myself am made entirely of faults, stitched together with good intentions. -quote