'Black Chain' indicates Too much Lube, Too long between cleaning, Very Dirty riding conditions.
To avoid 'Black Chain', use a very thin oil such as Home Brew, Rock'N'Roll, Boeshield, or Dumond Tech Light.
Apply liberally to the rolers, but wipe and wipe until no stain on your rag.
You want the Lube to penetrate deep inside the Rollers/Pins, but none on the outside to collect dirt.
I lube and Wipe Down my chain the night before every ride.