Add entire bottle of school glue to a bowl.
Mix in 1 1/2 tsp baking soda.
Add food coloring until you reach the desired tint for your Halloween slime.
Then mix in 3/4 tsp saline solution. Stir well. The slime will start to pull together into a ball.
Knead the slime with your hands. If it is still sticky, you can add about 1/4 tsp more saline solution.
Cut a leaf shape from felt.
Hot glue both the leaf shape and the cork to the mason jar lid.
Then tie raffia around your cork.
Use scissors to trim to length.