First, purple is found late and difficult to extract. Purple was discovered in19th century. The reason why many countries don't use purple as their national flags. It has a great relationship with the difficulty of extracting purple in the later stage. According to relevant records, the earliest purple came from conch. However, it takes thousands of conchs to extract one gram of purple dye, but this still can't stop people from pursuing noble purple. This purple dye is not only difficult to extract, but also has a rather unpleasant taste. This purple dye comes from the internal organs of conch. Because conch itself has a fishy smell, and the internal organs of conch must be fermented at high temperature during the extraction process, the smell can be imagined, and the clothes made of this dye are even more smelly. But even so, because purple represents nobility and rarity, it is still the object pursued by nobles. But printed on the national flag is not so perfect. One reason is that purple is difficult to extract, and the other is the disgusting stench of purple. Therefore, most countries around19th century did not use purple as their national flag.
Second, purple is a status symbol. ? Although it is difficult to extract purple, it does not stop purple from becoming a symbol of people's status. Because of its noble taste and rarity, purple has been a status symbol in China and the West for thousands of years. In China, purple represents good luck and good luck. China has a word from the East, which means auspiciousness and omen. Later, it was found that a plant called Arnebia euchroma can also extract purple. Purple is gradually moving towards people's lives. But at that time, the national flags of many countries had been finalized. It is impossible to change the national flag to purple. Therefore, purple rarely appears on the national flags of more than 200 countries around the world.