gel

Definition: Noun (pronounced 'jel'): (1) Gelatin filter: very thin, fragile but can be precisely coloured used in front or, occasionally, behind lens. (2) Coloured filter used in front of luminaires. (3) Gelatin: colloidal proten. (4) Verb: to turn liquid into a solid or jelly-like form e.g. when making emulsion for coating.

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