Colour calls provide information to lighting technicians about the gels needed for a rig, including the gel number, name, intended light source, purpose of the light, and total number of gels required. The gel code column matches gel numbers to specific colours. The name column identifies gel names and colours. The light column specifies what type of light fixture a gel frame is for. The aim column outlines what lights will be used for, helping with programming and focusing. The total number column indicates how many gels of a certain type are needed.