1-(2-Pyridylazo)-2-naphthol

Buffer solution BS pH 6.87 (ph

Lead(II) bromide

2-(N-Morpholino)ethane-sulfoni

Tin(II) chloride dihydrate

Sand

Magnesium bromide

Molybdenum solution 10000 ppm,

MOPS

Potassium bromate-bromide

Water