If you read the last blog about the physics of underwater photography you will understand why everything can look monochromatic underwater, once you have moved away from the surface. This can be misleading and often the new diver’s first introduction to the colour of our underwater world is during his or her first night dive.Without the blue of the daylight swamping the true colours of the reef, the diver’s underwater light illuminates everything in its true colours – and what a colourful world it is! It’s for this reason that experienced divers are often seen going into the water with powerful lights or torches even on the most brightly lit days. By taking a bright white light close to a subject, it’s revealed in its true kaleidoscope of tints. However, at night you’ll see the fishes in their night-clothes (so to speak) because often the colours they exhibit in daylight are different to those in the dark. It’s amazing how much marine animal life is actually bright red when you consider that red looks black to most marine life. Nobody can really explain the reasoning but it’s true. Often, fishes that may appear a dirty green colour by natural light are revealed to be bright scarlet in the beam of a lamp. Underwater photographers can take advantage of this phenomenon by lighting up their subjects with an underwater flashgun or strobe light while those shooting live action can employ powerful video lights to the same effect. Even the smallest subjects can be revealed in a startling vividness once they are subjected to a full spectrum of light. Sharks may be the guys in the grey suits, along with many other predatory pelagic species, but once you look closely at any territorial animal with the aid of your diver’s torch, you can appreciate the full range of hues that they wear. Big grouper suddenly appear to be much prettier than their otherwise brutish look might signify. Even green turtles can be revealed as more colourful than you would expect. You would not contemplate entering a dark wreck without a lamp to guide your way (and possibly a second one stowed about your person as a back-up should the battery in your primary lamp inexplicably fail). That may seem obvious but even rusty shipwrecks and their cargoes can be quite colourful beyond the range of the oxidising metal because they get encrusted with tiny sponges and hydroids that give them colour. It's a colourful world. As for soft corals, these colonies of animals blossom in a strong current and display themselves in a wide range of reds, oranges, yellows, purples and blues. Going diving on a tropical coral reef without the aid of a lamp is rather like turning down the colour on your television set and watching everything in black-and-white. Get yourself a good diving lamp and a back-up if you are diving at night or in wrecks and if you are shooting pictures, the people in Ocean Leisure Cameras, the store within the store, can fix you up with the appropriate lighting array. Come in and discuss it with them. The store is open seven days each week. Take a suitable light with you when scuba diving and reveal the colourful underwater world. If you've enjoyed reading these blogs, you will enjoy reading Amazing Diving Stories by the same author.