Carbon black itself is insoluble in water, mostly lipophilic, so when carbon black is added to water, it will float on the water surface and be insoluble in water. Here are some suggestions for you.

To make carbon black soluble in water, a large number of additives need to be added; Based on water, additives such as dispersant, glycerin, defoamer and suspending agent are added. With the help of a high-speed disperser, carbon black and water additives are fully and evenly mixed, so that carbon black and water form a liquid similar to color paste. The actual carbon black or particles are just invisible to the naked eye, just like being completely soluble in water. If you want to achieve better results, you can grind the liquid with a grinder after the above steps are completed, and the prepared carbon black liquid has better effects.

I hope the above summary can help you, thank you for your adoption!