蓝芯：
It is very high quality as it will pass: bend,light,rip,water testing
Extremely high quality print with crisp text and colors
This is a blue core paper stock
黑芯：
It is very high quality as it will pass: bend,light,rip,water testing
Extremely high quality print with crisp text and colors
This is a black core card stock
(Much higher quality then blue core)
Same thickness and ridged (not like the blue core cards that are thin and flimsy)
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