Hello Raymond,
I work in the furniture upholstery sector.
There are many different types of leather; but they fall into three main group types:
1. Fully Sealed = Fully protected
2. Semi-Aniline = Medium to light protection
3. Full-Aniline = Natural skin product; No protection
Groups 1 & 2 have a painted surface of, usually, polyurethane based colour.
Group 1 is Sh*t, usually used on cheap products manufactured in the far east.
The leathers are generally mechanically processed and the top surface is finished with the paint product.
Be careful here as any 'de-glazing' products may well strip the 'paint surface' off the hide.
Always test in a less obvious area. You may take the paint off the surface.
You will not effectively darken a painted leather surface unless you prepare, prime and repaint.
You also have diamond stitching which the stripping products may effect and cause rot, depending what the stitching thread material is.
Group 3 are pure natural skin products, usually through dyed with water based natural vegetable based pigments.
Sometimes they have a natural wax or oiled polished top finish.
They have no sealing surface treatments and develop a natural darker 'patina' with use.
Like and old school satchel or saddle of yore.
These leathers can easily take a staining product and darken the overall colour.
Buy a propitiatory leather stain and build up the colour in stages.
I cannot tell from the images what type of leather you have.
This is a simplistic view of a more complex subject.
I only advise caution before you start.
Or simply get the seat recovered in a leather of your choice.
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