Okay, then put potassium hydroxide pellets or potassium hydroxide solution in the bottle. Potassium hydroxide absorbs carbon dioxide, insert fluted coke in the mouth of the bottle, insert one of the leaf of de-statched plant to split coke into transparent bottle containing potassium hydroxide pellets or potassium hydroxide solution. Leave the plant in the sunlight. After a few hours, test this leaf and any other leaf of the plant for stash as mentioned.