In 20 19, a video of koi fish, a blue-and-white porcelain, was circulated on the Internet, and netizens released a "koi fish of Blue-and-White Porcelain" which claimed to be worth one million yuan. It is gorgeous and attracts many people's attention.

However, some netizens who love photography pointed out that in the video, when koi fish is near the edge of the orange basin, a faint purple will appear on the edge of the blue texture on his head.

Orange and blue should reflect green, and it can never be purple. There is basically only one possibility of this purple color: the hue of the video has been artificially adjusted in the later special effects software.

A netizen with fish farming experience also said after watching the video that the water basin in the video has a special name, called fish measuring basin or weighing basin.

It also has special production specifications and is made of glass fiber; The color is generally blue; There are also special measuring scales on the side wall and bottom of the fish basin, and the units are "portions" and "centimeters"; A white drain hole is also designed at the bottom of the fish measuring basin.

According to the clues of netizens, I found the same number of fish pots in the video in the online shopping software. As can be seen from the product screenshots, except for the different colors of orange and blue, other details are almost the same. Merchants told reporters that this kind of fish tank generally only produces blue, and almost no orange fish tank will be produced.

Therefore, it can be concluded that this is the use of special effects to adjust the tone of the whole video, resulting in the original red, white and koi fish turned blue.