Special B refers to a type of dark, flavorful crystal malt traditionally malted in Belgium. In small amounts, it gives a unique flavor to the finished beer that is often compared to raisins or dried fruit. This malt is always dark, but the color and flavor vary more than most other malt styles; most of the commonly available varieties are in the 110-160 L range, but it may be even darker. Don't depend on this software to calculate the color of your beer correctly, since it may be expecting a much darker malt than you are actually using; some older sources assume Special B will be over 200 or even up to 300 L. While some sources still claim that Special B must be mashed, it is a crystal malt and can be steeped with an extract batch without adding significant protein to the beer.