Ambrose Light (ship) Ambrose Light (ship) Ambrose Light was a brigantine, operated by Colombian rebels. It was captured by USS "Alliance" as a suspected pirate vessel in 1885. The accusation of piracy was rejected by a court of law. On April 24, Commander Lewis Clark, of the South Atlantic Squadron, was sailing to Cartagena, on the Caribbean coast of Colombia, when the lookouts aboard "Alliance" sighted the one-gun "Ambrose Light". It was flying a strange flag featuring a red cross over a white background so the Americans assumed the vessel was a pirate ship. A chase began and the Americans were preparing to
Colour cast used to reduce the blueish tint caused by daylight. Blue filters reduce the orange colour caused by incandescent light. A variety of coloured filters in varying degrees of intensity are available. Kodak's amber filters, for example, vary from palest yellow ("81C") to deepest amber ("85B"). A photographer chooses which filter to use based on the quality of the ambient light. Colour temperature meters can read the temperature of the existing lighting conditions and guide the selection of the filter. Clouded sky, for example, requires a paler amber than clear blue sky. If a filter is unavailable, flash is an alternative