Can postcards turn yellow without plastic bags?

Postcards will turn yellow without plastic bags. Postcards that are not sealed will oxidize in the air, so the colors that cannot be preserved for a long time will slowly fade and turn yellow over time. Go to the photo studio and tell him you want plastic, that is, put a plastic seal on the outside of the postcard, which will slow down the fading and yellowing.

Postcard definition

A postcard is a card with an image written on it, which can be mailed directly without an envelope. When designing and posting, images can be photographs, paintings or stamps with sufficient face value. There is an image on the front, the postal code, address and name of the recipient are written on the back, and what you want to say to the recipient is written in other areas.

The advantage is that you don't need an envelope, but the disadvantage is that there is little space and no privacy. What is written on the postcard is public and can be seen by others. The content usually does not involve concerns about privacy, so it is called a clear letter.

Postcard postage is cheaper than ordinary letters. According to the business description of China Post, ordinary people can print postcards by themselves, but they are not allowed to label China Post. Therefore, many people will call postcards with postage symbols issued by the post office postalcard, while private printers call them Postcards.