In the United States, its black.
Flammable oil and gas fires are class B fires, needing a class B extinguisher.
There are several categories of fire extinguishers. It depends on where the extinguisher is likely to be used and on what type of fire is to be expected. For example: a soda and water extinguisher is commonly used for general type fires. But, due to the risk of being electrocuted, a soda and water extinguisher would be dangerous to use round high voltage electrical equipment - so a carbon dioxide extinguisher would be used instead. On oil fires, a foam extinguisher would be best, as a soda water extinguisher would simply spread the area of the oil fire, and even increase the intensity of the flames, while the foam would smother the flames, cutting off the oxygen to feed the fire.
Class B: Class B extinguishers are used on fires involving flammable liquids, such as grease, gasoline, oil, and oil-based paints.
A Class A, B, C, or ABC fire extinguisher works wonders on several different types of fires. A is good for wood, paper, etc. B is good for liquids. C is good for electrical fires. Do not use a Class D, for these are best on metals (such as magnesium).
Soda water is used on general fires (wood, paper, etc). Foam is used on petrol or oil fires, to avoid spreading the fire. Carbon dioxide is used where there is electrical equipment, and there is a risk of electrocution. Then there is dry powder which is classed as a multi-purpose extinguisher.
No - you wouldn't want to put out an oil fire out with water, it would spread. There are also checmicals that are used to deprive the fire of air. Powders (Like your household extinguisher) fires can also be smothered with blankets etc. Explosives are used to put out very large fires like oil well fires.
Soda water is used on general fires (wood, paper, etc). Foam is used on petrol or oil fires, to avoid spreading the fire. Carbon dioxide is used where there is electrical equipment, and there is a risk of electrocution. Then there is dry powder which is classed as a multi-purpose extinguisher.
Class B extinguishers are used for liquid fires, typically gasoline and oil fires. Extinguishers rated ABC will be effective against all three classes, but seldom as effective as a dedicated Class B extinguisher.
Foam spray extinguishers are not recommended for fires involving electricity, but are safer than water if inadvertently sprayed onto live electrical apparatus.
Class B fires are fires in flammable liquids such as gasoline, petroleum oil and paint. Class B fires also include flammable gases such as propane and butane.Class B fires do not include fires involving cooking oils and grease (these are now Class K fires).
Liquid (oil) fires.
the kind that puts the freaking fire out