What kind of sand is this? Ask for a name? ~

This is a kind of waterproof sand, which will form a barrier like a gas film and mix with water, which has been around for 3 or 4 years.

After selling, you can pile sand sculptures in the water. Children like to play, but it is difficult to separate different colors after mixing. It's not my original answer to see people selling moon sand or more in the United States now, but I hope I can help you.