> The blackened area could indicate moisture and fungus or dirt, which is
> a normal thing. But I see the dark area normally at the lower areas of
> the bricks only, not so much on the sides and top. Gradient map.
> 
> ---

> http://www.avg.com
> 

There can be some pigment segregation that happen before the bricks are 
cooked. It tend to show more on the length that the other directions, 
but it's still there. Much more notable on older bricks than modern ones.

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