Why do barbershops put three-color columns and hotels hang lanterns?

Hello, when you say lanterns, do you mean the tricolor columns next to the hair salon?

I guess

1 It's because 17 th century European countries don't use electricity at night, and they have to use iron lanterns to go in and out. A barber saw this situation and hung a big iron lantern in front of the hair salon, which can help the public light up the road and attract guests, killing two birds with one stone. As a result, one word spread to another, and hairdressers all over the world followed suit. After transformation, they became the three-color lampposts today.

There were many carriages coming and going on the road at that time. If horses are frightened, they will run wildly on the road or run into shops on the roadside. So, the owner of a shop hung an iron lantern made of tricolor paper in front of the shop to remind the groom to love horses, which was quoted by various shops and became the light box signboard of the shop and the tricolor lamp post of the barber shop today.

In ancient China, it was spread to foreign countries through the flag with the word "wine" written in front of the hotel.

I hope my answer can help you.