Fluoride test • Test discs and reagent for the semi-quantitative determination of fluoride ions • The fluoride test is especially suited for rapid control of fluoride concentrations. • Its purpose is to define concentration ranges and to detect values which fall short of or exceed given limits. • Chlorates and bromates cause white discolourations of the test paper. • Addition of sodium dithionite (Na2S2O4) will circumvent this interference without affecting the fluoride test. Product data • Presentation: Box of 30 test discs with reagent • Colour reaction: red → white • Gradation: 0 · 2 · 5 · 10 · 20 · 50 · 100 mg/l F–