  Using data from the Sloan Digital Sky Survey Moving Object Catalog, we study
color as a function of size for C-complex families in the Main Asteroid Belt to
improve our understanding of space weathering of carbonaceous materials. We
find two distinct spectral slope trends: Hygiea-type and Themis-type. The
Hygiea-type families exhibit a reduction in spectral slope with increasing
object size until a minimum slope value is reached and the trend reverses with
increasing slope with increasing object size. The Themis family shows an
increase in spectral slope with increasing object size until a maximum slope is
reached and the spectral slope begins to decrease slightly or plateaus for the
largest objects. Most families studied show the Hygiea-type trend. The
processes responsible for these distinct changes in spectral slope affect
several different taxonomic classes within the C-complex and appear to act
quickly to alter the spectral slopes of the family members.
