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"Aniline - Dyes and finishes that contain no pigment. When used on leather they provide a rich, clear stain that allows the natural character of the article to be seen."
From the definition page of the Horween Website
Understanding the concept of dyed vs pigmented leather is important when evaluating leather. Dyes, which are water soluble, add color by bonding with the hide during the tanning process. Dyed leathers highlight the natural qualities of the hide. Pigmented leather, essentially paint, has color added at the end of the tanning process that coats the surface of the leather. This is desirable when attempting to get a uniform surface and a specific color. We’re not looking for that. Our products are made with full grain aniline leathers and once you know the difference, we’re sure that you will never settle for less again.