[Answer] Which color only appears on two country's national flags?

Step 1 : Introduction to the question "Which color only appears on two country's national flags?"

...1. Orange 2. Purple 3. Brown 4. Grey

Step 2 : Answer to the question "Which color only appears on two country's national flags?"

Purple - Purple is the rarest national flag color in the world, and we have history to thank for it. If you've ever heard that purple was associated with royalty and nobility, it's because purple dye was incredibly hard to come by before the 19th century. There was one species of Mediterranean sea snail that produced purple ink, but it took 10,000 of them to make a single gram of dye! Today, you'll only find two countries in the world with purple on their national flag: Dominica and Nicaragua. Even then, purple makes up just a fraction of the overall spectrum on these two flags. For eight years in the 1930s, Spain also flew a flag with a purple stripe, but the nation’s current flag has since returned to its original red-and-yellow stripes.:

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