Required materials: A4 paper, black tea water and soft brush.

1, soak a cup of black tea water, and filter tea leaves as long as tea leaves.

2. Take out the prepared soft brush. The bristles must be soft, too hard will destroy the paper structure and make the old effect unnatural.

3. Place the prepared A4 paper horizontally on the desktop.

4. Spread the black tea water evenly on the paper with a brush.

5. After smearing, let the paper stand and air dry naturally. In this way, old paper will have a good effect.

Cracking forgery technology:

1. Paper is divided into two old types: one is "dyed paper", which includes using sugar water and chestnut shells as raw water, or using tea leaves, or using other methods to dye the paper yellow-brown, or using smoked water to make the paper look old; The second is to use "old paper for new". If the forger has ancient paper, he can print the contents of ancient books on paper and order them as "ancient books".

2. Forged Prefaces and Postscripts In some repeatedly printed copies, in addition to the prefaces and postscripts of the original book, new prefaces and postscripts are added to describe the reasons for reprinting, and the name, year and month are also written after the prefaces and postscripts. All these indicate the true age of books. Forgers often cut off the prefaces and postscripts that are beneficial to them, or change their dates, and also forge prefaces and postscripts that are beneficial to them.

Refer to the above content: Baidu Encyclopedia-The paper is old