| Leaf of E. canadensis in water |
| Leaf of E. canadensis with added solution of 2M NaCl. |
| Onion peel (Allium cepa) in water. |
| Onion peel (Allium cepa) with added solution of 2M NaCl. |
| Untreated potato. |
| Untreated paprica. |
| Potato treated with Lugol solution. |
| Paprica treated with Lugol solution. |
| Leaf of E. canadensis treated with Lugol solution. |
| Calcium oxylate crystals from outer scales of onions (Allium cepa). |
| Tobacco leaves under microscope. No crystals visible. |
| Untreated petal of Pelargonium flower. |
| Petal of Pelargonium in a solution of 2M NaCl. |
| Untreated petal of Petunia flower. |
| Petal of Petunia flower in a solution of 2M NaCl. |
| Calcium oxidate crystals from leaf of Tobacco plant treated with Ethanole. |
| Top left) Pelargonium grown in sucrose Lower left) Pelargonium grown in water Top right) Tobacco leaves grown under light + dark Lower right) Tobacco leaves grown indark |



