Freeze drying involves freezing floral material and then reducing ambient pressure, causing frozen water to transition directly from solid to gas (sublimation). This process effectively preserves the shape, color, and structure of flowers, making it a widely adopted technique for high-quality floral preservation.
(A) Water drying – Incorrect. This is not a recognized method and frequently results in degradation.
(B) Air drying – Incorrect. While simple, it does not preserve a high-quality finish.
(C) Freeze drying – Correct. This method maintains high quality and is relatively straightforward with appropriate equipment.
(D) Vacuum drying – Incorrect. It is functional but less efficient or straightforward than freeze drying for floral preservation.