C-9011 Silica Comparator is a component of K-9011 Silica ULR CHEMets Visual Test Kit and is designed to be compared against the color formed in R-9011 Silica ULR CHEMets Refill. The comparator's range is applicable to many industrial applications. Color standards are blue in color and cover a range of 0 to 0.20 ppm SiO₂