How to distinguish engraving books from photocopying books?

1, paper and binding, engraving printing will never have the mechanism of paper printing, that is, there are yellow spots on paper. In addition, the cover paper is also different.

2. Photocopy book printing is more consistent in ink color than block printing.

3. There will never be any unevenness on the paper of photocopies (that is, the position with words is concave), and there will be oil stains in the frame of some photocopies (the white paper printing of four series is more obvious), while block printing is ink brush printing, and there will never be any.

4. Occasionally, there will be residual hairs of the brush on the inside of the book leaves, but photocopying is generally not.

Bottom line: You can tell the difference by watching more.

If it is a movable type book, it is applicable except the second one.