Dorr 40.5mm Circular Polarising DHG Slim Filter

White - A colour combining all colours

Blue - A primary colour

Glass - A solid, typically transparent. Brittle and used in windows. The first patent granted in the UK was for Glass.

Filter - A device used to separate mixtures

Filter - An optical device to remove or enhance particular wavelengths of light.

water - A chemical substance. Chemical formula H2O.

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