A class of semi-liquid substances, gels are usually a jelly-like, translucent suspension of solid particles in a liquid. Examples include hair gel, and some types of toothpaste.

Gel is slang for gelatine, now common called simply color. It is/was used to color theatre lights. Gelatine is very brittle, vulnerable to heat and humidity, and fades quickly. It was common to use a pounce wheel to punch a series of holes to facilitate air flow to help cool the gel to prevent burn out. Gel has been replaced in the past couple decades by synthetics such as polyester. These synthetics tend to be more robust, and are less sensitive to heat and humidity. Most theatre electricians use a grease pencil to mark the manufacturers number on the gel, as there are over 1000 different colors. See also gel

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