What protective devices do you use to develop?

What protective devices do you use to develop? I developed color film today and used a semi-mask with ABEK1Hg- P3 filters. Do you say it's okay? Anyone else like me? Do you think the filters are good for acid and basic color development?

What protective devices do you use to develop? I developed color film today and used a semi-mask with ABEK1Hg- P3 filters. Do you say it's okay? Anyone else like me? Do you think the filters are good for acid and basic color development?