Question

Which if the following is used to reduce coloration?

(a) CeO2

(b) TiO2

(c) Na2S

(d) Co3O4

The question was asked during an interview for a job.

I need to ask this question from Properties of Glass in chapter Glass Packaging Materials of Food Packaging Technology

Answer 1

Right answer is (a) CeO2

The explanation: The addition of CeO2 (it is reduced to Ce2O3 by the radiations) in glasses in amounts up to 1.5% has proved an effective means of reducing coloration. Unfortunately, it is a very expensive oxide, so glass containers treated this way are significantly more costly than standard containers.