Blue in the national flag is a symbol of the ocean, so the countries with blue tones in the national flag are mostly maritime countries.
Extended data:
National Flag of the People's Republic of China is a five-star red flag with a red flag face and an aspect ratio of 3:2. There are five yellow five-pointed stars on the upper left, and four small stars are arched on the right side of a big star, each with a corner pointing directly at the center of the big star.
1On September 27th, 949, the first plenary session of China People's Political Consultative Conference formally decided to adopt the scheme of five-star red flag on a red background, and renamed it "five-star red flag". On September 29th, 1949, People's Daily published the pattern of the new national flag and its making method, which was provided for all walks of life.
1949 10 1 People's Republic of China (PRC) founding ceremony, the five-star red flag was raised in Tiananmen Square for the first time.
The first national flag flying in the square was sewn by seamstress Zhao. She finished the work on the afternoon of September 30th 1. At first, I was not sure whether the five-star red flag was designed by him, because there was no sickle and hammer on the big five-pointed star in the published pattern.
However, the General Office of the Central People's Government later sent him an official letter, officially informing him that he was the designer of the national flag and attaching 5 million yuan as a reward.
Baidu encyclopedia-national flag
Baidu Encyclopedia-China People and the National Flag