Queen Anne's Lace?
We took some "weeds" and 6 cups of water and added food coloring to each cup
Then we waited....and waited......and waited.....
Days went by.
We actually forgot about them, because I put them outside.
It worked....the food coloring turned the weeds to their designated color
Yellow (if you look closely)
Not all of them turned colors, but it did work for the most part.
The boys thought it was cool and that was good enough for me!