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| Stain | Target (colouration) | Result |
|
|---|---|---|---|
| Immature (Stage 2) | Mature (Stage 4) | ||
| Toluidine blue O | Pectins (pink-purple) | Positive | Positive |
| Lignin (blue-green) | Negative | Negative | |
| Cellufluor | Cellulose (blue-white fluorescence with UV) | Positive | Faint positive |
| I2KI | Starch (brown or black) | Negative | Negative |
