These turn from orange to green (or blue to pink) to tell you exactly when they are saturated.
Finding desiccant depends on your volume needs—whether you need a single packet for a camera bag or a bulk drum for industrial shipping. Quick Answer: Top Places to Buy where to buy desiccant
The gold standard for electronics, medicine, and food. It is non-toxic and often "indicating" (changes color when full). These turn from orange to green (or blue