... gel is currently presented purple, orange or yellow.2 With silicon dioxide as the chief ingredient, the product ... 3 Its color varies as humidity changes.Use:Mainly for drying and indicating humidity of precision instruments, medicine ... YellowRH=50% >Dark Green Size :1-3mm,2-4mm,3-5mm,4-8mm Packag: 25kg compound bag or 25kg drum, ... to green or to white (1-3mm, 2-5mm, 4-6mm, etc) for power transformers