Range

Colour

Tio₂ (ppm)

Cu (ppm)

Sum (Ce, La, Y)

>99%

?

?

>150.24

97.5% - 99%

?

?

131.1 - 150.24

84.5% - 97.5%

905.55 - 990

5611.88 - 8967

50.19 - 131.1

50% - 84.5%

150 - 905.55

451.5 - 5611.88

16 - 50.19

<50%

<150

<351.5

<16