Silica Chemical Test Kit - HI38067 HANNA The HI38067 is a chemical test kit that uses the heteropoly blue method to measure silica. The HI38067 is supplied complete with all of the reagents and equipment necessary to perform approximately 100 tests. • Pre-made reagents for ease of use • All reagents marked with expiration date and lot number for traceability • Checker® disc for more accurate determination