[1] Dark streaks in the wood [2] Natural discoloring of the wood due to mineral deposits in the tree [3] No repair needed - adds to individuality of your Butcher Block! [0] 
Mineral Streaks
P r o b l e m
E n d C h e c k s
S p l i t s
W i n d S h a k e s
W a r p a g e
R a i l E x p a n s i o n
S t a i n s
D a m a g e
M i n e r a l S t r e a k s