wisedry Flower Drying Silica Crystal - 2 Lbs, Fine Crystals < 1mm, Colour Indicative, Reusable[ Fine crystals < 1 mm] Flower drying for DIY crafts: small silica gel with dust proof treatment, to avoid physical impact on the petals and to increase health. If necessary, wear mask and gloves when operating [ Color Indicator ] Contains orange beads, when the orange turns dark green, it indicates that the silica gel is in saturation [ Reusable ] Reactivate the silica gels with the microwave or oven; when the dark green beads return to orange, reuse