The kids really liked the way this worked.
First pour white glue in a pattern or picture.
Then coat with table salt, not mom's really expensive Himalayan salts.
Shift salt back and forth, over sink is best or outside, to be sure all glue is coated well.
Once glue is dried, one picture took 2 days as it was really thickly coated with glue, paint with water colours and watch the colour spread.
Science and art all in one!!