The term "saturated" are used for silica gels that have been "used". How would you know that your silica gels have saturated? When is right time to change your silica gels for optimum effectiveness? Thankfully, SilicaGelly supplies "indicating silica gels" that are orange in color when fresh, and turns to green once they are saturated, like the picture above. This way, it is easy for you to know when your silica gels need to be replaced.