Don't be surprised if you see some friends' signature documents in the chemistry bar as "resident ID cards of Baidu Chemistry Bar" or screenshots of some members' speeches in this bar. This is the signature document culture of chemistry bar.

So far, the resident ID card of Baidu Chemistry Bar has been officially used in three versions (the first generation, the second generation, 2S, and the third generation), and there is also a simple ID card of the periodic table of elements, which is small in quantity and not distributed in large quantities. It's out of print now.

These signature documents with the theme of chemical substances have well publicized the chemistry bar and highlighted the theme of the chemistry bar.

The first generation ID card has no specific template and format, and its style is relatively simple. Generally speaking, there is no certain rule.

To the second generation ID card, the style will be more refined. There are certain size requirements, and the production is more exquisite.

As some low-level members are not online for a long time after applying for ID cards, 2s generation black and white ID cards have been introduced. After three generations of ID cards, the origami style is refreshing. Third-generation ID cards are the most difficult to forge, and they can't be made without certain technology.

There are also some signature documents, not about chemicals.

It is based on speeches, dialogues and special pictures of some bar friends. These are used as signature files. Most of them are classic speeches by some bar friends: some are cute, some are out of control, some are spitting, and some are classic conversations between bar friends. Because there are too many kinds and quantities, I won't go into details here.