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You asked:

what does a red candle mean

'Candle' has a few different uses: as a verb, 1. examine eggs for freshness by holding them against a light; and as a noun, 1. stick of wax with a wick in the middle; 2. the basic unit of luminous intensity adopted under the Systeme International d'Unites; equal to 1/60 of the luminous intensity per square centimeter of a black body radiating at the temperature of 2,046 degrees Kelvin.