Flower Drying Art Silica Gel preserves flowers and keeps the natural beauty that fresh flowers have. It is a granular compound that offers the best method of preserving flowers as it actually absorbs the moisture of the flower with little damage to the flower's color and form. There is no limit to the bouquets you can preserve, and it is non-toxic! You can quickly dry flowers in the microwave, or over time! Drying flowers in the microwave takes minutes, while drying flowers over time will usually take 36 to 48 hours. The flowers that dry best in Flower Drying Art Silica Gel are: rose, aster, carnation, marigold, dahlia, larkspur, geranium, zinnia, chrysanthemum and delphinium. Flower Drying Art never wears out and can be used over and over again!