As promised, above the oiling as I usually do it. These days I rarely bother to really rub the oil in, because these really are not its first conditionings either. However, I recommend rubbing very meticulously your leather goods for the first dozen or so times. Better be safe than sorry.
Above the generic olive oil I happened to grasp first from the cupboards today. Beside the Malden binder in personal size, also known as the Brains at our household.
I then pour some oil (whichever oil, really) onto the palm of my hand and just spread it merrily around the binder.
You will see how it will start to seep in to the leather, simultaneously making you a respectable leather- product- owner, while giving your leathery item extended lifespan. You may proceed patting your own back or shoulders if other people are not available to congratulate you on this outstanding act of decency.
At some point it pays to spread out the remaining oils evenly to the binder- or to add more oil to the thirstier areas.
As you will see, even after 37426348736482 applications, all of that oil will be absorbed. Once this stops from happening, another round of back-/shoulder patting is in order as your leather now is in the state of "saturated" which most mimics its natural state while it still was on a living, breathing and feeling animal. Continue thine oilings until saturated state is achieved. This might take several months even for us most enthused greasers.
For the insides, I just usually open the binder, empty its pockets and...
Get oiling. This is best to do in the evening and leave the natural fats seep into the leather over night. Having laminated page lifters on either side helps protecting the pages as well. I do the same treatment to both front- and back parts, usually during consecutive evenings.
All of these pictures were taken close to window, but since it was a cloudy and murky day, I added an artificial light which caused the reflective bits.
Above is a picture of the oiled binder closed. This is next to window, in natural daylight. Compared to the dry, scale-like leather this binder was just months ago, it has a completely different texture now.
And the binder opened. Leather still is "rustic" in its appearance but to touch it, feels like touching finest aniline leather. And after every application, the leather gets softer and softer.
Music of the day.