Leather is like wood. It can be stained (dyed) or painted (pigmented finish or coating). Leather dyes penetrate and accentuate the natural variations in the fiber. Dyes are in the leather (a chemical bond).
Leather paints and pigmented finishes coat the fiber; they are on the leather (a physical bond). They can be one solid color (monochromatic) or multiple colors and tones (mottled or base-and-print).
Vinyl (a synthetic) cannot be dyed; it can only be refinished.
Dyes are prone to fading and transference (just as blue jeans can stain furniture). Most leathers are dyed. The variable is their finish. Some have no finish (aniline) or a light clear finish (semi-aniline). Their absorbency makes them prone to body oil and other stains. Some leathers (like those in auto interiors) have a pigmented urethane or acrylic finish that better retains color and resists stains. However, even pigmented finishes can be worn and discolored with use.
One cannot dye leather a lighter color. Only a pigmented finish (paint/coating) can achieve this.
Rub ‘n Restore® products are water-based acrylic pigments that are suitable for vinyl and all leathers except suede and nubuck (though we’ve had customers do it). Use of our products on aniline will slightly cool the feel of the leather by adding a water-resistant finish. The leather will continue to breathe. While it may still exhibit absorbent qualities, it will be more stain and fade-resistant than traditional leather dyes.