you may have some substandard or imperfect solar cells,the goods with some imperfection such as below,we buy these kinds of goods a lot every month,you can contact me via the solar cells picture I have loaded. 

1.visual defect on surface, 
2.color difference 
3.paste spot on edge 
4.a little chip off on the edge 
5.unsorted/mixed solar cells 
And the solar cells are with size 156x156(6''),125x125(5'') mono or multi, 
we sincerely hope to establish a long-term business relation with your esteemed company 
Pls email me your latest stock available as attachment. Also, inform me about the MOQ, Delivery time, quotation,and payment terms. 

Looking forward to hear from your soon~ 

grace wu