To wet preserve plants, submerge them in a solution of 70% ethyl alcohol (or 70% methylated spirit or denatured alcohol) and 30% water. This method, sometimes called a spirit collection, effectively preserves the plant material for long-term storage and study.
Here's a breakdown of the process:
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Preparation:
- Gather the plant specimens you wish to preserve.
- Prepare the preservation solution: Mix 70% ethyl alcohol (or methylated spirit/denatured alcohol) with 30% water. Note: A pharmacist can prepare this solution for you.
- Choose appropriate glass jars or containers with tight-fitting lids. The size should accommodate the plant material comfortably.
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Preservation Process:
- Submerge the Plant Material: Carefully place the plant specimens into the chosen container. Ensure that the plant material is fully submerged in the 70% alcohol solution.
- Remove Air Bubbles: Gently tap the container to release any trapped air bubbles.
- Seal Tightly: Secure the lid tightly to prevent evaporation of the alcohol and contamination.
- Label Clearly: Affix a label to the container indicating the plant species, date of collection, location of collection, and any other relevant information. Use a waterproof pen or label.
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Long-Term Storage:
- Store the preserved plant specimens in a cool, dark place away from direct sunlight and heat.
- Periodically check the fluid level in the containers and replenish the alcohol solution if necessary to keep the plant material fully submerged.
Important Considerations:
- Alcohol Concentration: Maintaining the correct alcohol concentration (70%) is crucial for effective preservation. Too little alcohol can lead to decay, while too much can cause excessive hardening and brittleness.
- Safety: Ethyl alcohol and methylated spirits are flammable and should be handled with care. Avoid open flames or sparks when working with these substances. Work in a well-ventilated area.
- Alternative Preservatives: While 70% alcohol is the most common preservative, other options exist, such as formalin-alcohol mixtures, but these may have additional safety concerns. Research the suitability of alternative preservatives before using them.
By following these steps, you can successfully wet preserve plants for future reference and research.
