What are the types of binding cardboard?
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Binding cardboard has the following
(1) Gray cardboard. Also known as the book cover cardboard, it is the national industry-made cardboard for book sealing.
(2) Grass paperboard. Also known as horse dung cardboard, the surface is rough and yellow.
(3) Yellow cardboard. A surface that is smoked yellow (smooth, hard, and rigid cardboard with the same color as kraft paper, often used to make binding envelopes and also used to make book covers)