I used hair serum or hair finishing oil to recondition and resheen an aged black calfskin 224 reissue that had gone dull & dry with time. I have also used it on a navy vintage lizard classic flap and a black crocodile classic flap. It works a treat, use it sparingly though. Elvive extraordinary oil & Garnier ultimate blends sleep perfector oil were the specific brands. I would say the Garnier is better. I have been using this on my leather items for 15 plus years, but only recently on my Chanel bags.