Question about lincoln cents grading

[EgCollector]

The following is written in the lincoln, wheat ears reverse page of the 2008 Red Book;

 

"Dicoloured (brown) or weakly struck piecesare worth less."

 

what is meant by the brown colour; is it the colour of the whole coin or he means the brown spots or areas of corrosion that may affect the coin.

 

 

Thanks

[thedeadpoint]

I assume they mean brown toning instead of a fiery orange.

[EgCollector]

Thanks