The formula of spongilla powder between color and quality：
Whiter = Better
Color of Spongilla Spicules
The Chrominance of Spicules is the comparison test which is according to Natural Colour System® (NCS) standard.
NCS - Natural Colour System® is an international scientifically based color system that allows for accurate cross-industrial color communication for designers and manufacturers and customers. The system allows you to describe the color on all imaginable surfaces. This has made the color system a global standard for definition, quality assurance, and communication of color.
The Comparison Test of Spongilla Spicule Chromaticity