@babygems Ooh! This reminds me of a family favourite. Put a layer of baking soda on a cookie sheet and give the kid a couple of small bowls of vinegar/food colouring and and eye dropper. Super fun, easy clean up.
@saltlamp We got ours when kid #1 was a year old... he's now 10.5 and they are still in good shape and get near daily play (7yo sibling.)
I say this because they are pricy, but worth the cost. Serious r/buyitforlife toy.