284110 Aluminates
284120 Chromates of Zinc or of Lead
284130 Sodium Dichromate
284140 Potassium Dichromate
284150 Other Chromates and Dichromates, Peroxochromates
284160 Manganites, Manganates and Permanganates
284170 Molybdates
284180 Tungstates (Wolframates)
284190 Other Salts of Oxometallic or Peroxometallic Acids