How do you get coalesces?

A few antonyms are divide, separate, or dissolve.

To come together as a solid mass.

divide

She prepared a lovely congealed salad for the luncheon, but it seemed to take longer than usual to coalesce, so they all had to wait until the salad had firmed.

"The two paints began to coalesce until they blended into one color." "The soap bubbles will group together and coalesce, forming larger bubbles.""In the detective's mind, the various clues began to...