Anti-flash white is a color that's used on some really special clothes that protect people from getting hurt if there's a big explosion or something that makes really bright light.
When there's a big boom or something that makes a bright flash, it can be really dangerous for people's eyes and skin. But these special clothes are made with a special white fabric that's really reflective. That means it reflects or bounces back the light and stops it from hurting you.
The white color is important because it reflects a lot more light than other colors. Think about when you wear a black shirt outside on a hot day - it gets really hot because it absorbs the sunlight instead of reflecting it. But if you wear a white shirt, it's much cooler because it reflects the sunlight away from you.
So, in summary, anti-flash white is a special color that's used to make clothes that protect people from getting hurt from bright flashes of light, like in explosions. The white color reflects the light and makes it less dangerous.