During the Ming and Qing Dynasties, after books were first engraved, publishers usually printed in red or blue, revised and corrected, which was equivalent to "proof" in modern publishing and printing, and then printed in ink. Lin Shu Hua Qing said: "There is only one color printed in blue, such as the fifteen volumes of Mozi by Huang Ji ... all of them are suspected to have printed samples from the beginning, so they can be corrected if they are taken, and the blue print is not an ordinary version."
Because blue print is the earliest print of a book after engraving, it is called "blueprint for initial printing". Later, the word "blueprint" in the sense of "documentary evidence" came from "blueprint for the first printing"
Commonly known as "blueprint"
That is, the marriage and childbirth certificate of the childbearing age population. Generally, you need photos to fill in the form in the neighborhood Committee, and then go to the street family planning office to handle it.