found this:
SEMI-ANILINE VS. ANILINE LEATHERS
The most commonly asked question by the consumer regarding leather upholstery is whether or not the leather is aniline dyed. Unfortunately, the average consumer does not understand what aniline dyed leather is. Most consumers believe that aniline dyed leather is the best leather available because it has been dyed all the way through with the same color; thus, a hide should be the same color on both the front and back. Indeed, this is a feature of aniline dyed leather, but pure aniline leather has other features that may not meet the consumer's needs. The following paragraphs should clarify the difference between semi-aniline leather and pure aniline leather. Keep in mind that the term "semi" is actually a misnomer; it does not mean partial. In fact, a more appropriate name for semi-aniline leather would be aniline plus pigment.
Semi-aniline leathers or aniline plus pigments (AP) are dyed in vats with aniline dyes that penetrate throughout the hide so that the color goes all the way through the hide. However, the processing of semi-aniline leathers is taken a few steps further. After the leather is aniline dyed, a pigment color is applied to the top of the hide to guarantee a consistent color on the top surface of the hide. Next, additional finishes may be applied to the leather by hand or by machine to impart an antique look or some other special effect. Finally, a clear protective coating is applied to make the leather stain repellant and sun resistant. The sheen of this protective coating can be varied to give a matte finish or a high gloss finish.
Likewise, pure aniline leathers (A) are dyed in vats with aniline dyes that penetrate throughout the hide so that the color permeates and goes all the way through the hide. However, neither a surface pigment color nor a protective coating is applied. A hand antique finish may be applied. Because pure aniline leather does not have a pigment color applied to its top surface, there will be variations in color throughout the hide's surface. Also, the lack of a protective coating makes this leather more susceptible to staining and fading.
Finally, pure aniline leathers may also be distressed or buffed to create an open nap. These leathers are referred to as Nubucks (N). These options are the softest available and have a velvety feel, but are the most susceptible to fading and staining because of the open nap.
It is important that you understand the differences between semi-aniline (AP), pure aniline (A) and nubuck (N) leathers. It is also important that you understand that one type of leather is not more desirable than the other. Each leather appeals to a different customer. When selecting the leather that is right for you, your lifestyle and intended use should be taken into consideration. In general, softness and wearability are at opposing ends - pure anilines (A) or nubucks (N) are the softest, silkiest options available, but they will also scratch and are susceptible to fading and staining. Aniline plus pigments (AP) have a harder, firmer surface due to the topical treatments. These leathers are the easiest to maintain and keep clean, but they are not usually as soft.
One of my products that I personally do not retail, others do is DYO Leather Balm. Use this once a month on smooth leather, do not use on your dash as the sun will affect it, then it will migrate to your windshield. Also the DYO Leather Balm will repel oils from you skin etc. Most shoe shops have it, or it's on Amazon. 
