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The rusticle consists of up to 35% iron compounds including iron oxides, iron carbonates and iron hydroxides. The remainder of the structure is actually a complex community of symbiotic or mutualistic microbes including bacteria and fungi that use the rusting metal as a source of foodFood is any substance normally eaten or drunk by living organisms. The term food also includes liquid drinks. Food is the main source of energy and of nutrition for animals, and is usually of animal or plant origin. The study of food is called food scienc, collectively producing the mineral compounds as waste products and hence forming the rusticle.

Since rusticles are found on wrought iron rather than other ferrous metals, it is supposed that the microbes also use the sulfurSulfur (or sulphur see spelling) is the chemical element in the periodic table that has the symbol S and atomic number 16. An abundant tasteless odorless multivalent non-metal, sulfur is best known as yellow crystals and occurs in many sulfide and sulfate and phosphorusPhosphorus is the chemical element in the periodic table that has the symbol P and atomic number 15. A multivalent, nonmetal of the nitrogen group, phosphorus is commonly found in inorganic phosphate rocks and in all living cells but is never naturally fo impurities found in the metal.

Structurally, the rusticle contains channels to allow water to flow through, and they seem to be built up in a ring structure similar to the growth rings of a treeThis article is about the biological organisms known as trees. For other meanings of the word see tree (disambiguation). oak tree in Denmark A tree can be defined as a large perennial woody plant. Though there is no set definition of size, it is generally. They are very delicate, and easily fall apart into fine powder if knocked.

The outer surface of a rusticle is smooth redRed is a color at the lowest frequencies of light discernible by the human eye. Red light has a wavelength of roughly 700 nm. Oxygenated blood is red due to the presence of hemoglobin. Red light is the first to be absorbed by sea water, so that many fish in appearance from the iron (III) oxideIron (III) oxide also known as ferric oxide red iron oxide synthetic maghemite rouge or rust is one of several oxide compounds of iron, and is most notable for its ferromagnetic properties. Its chemical formula is Fe O. The mineral form of ferric oxide is, while the core is bright orangeSee also Orange for other meanings of the word. The colour orange occurs between red and yellow in the visible spectrum at a wavelength of about 620-585 nanometres. It is the same colour as the fruit for which it was named. With natural colouring material due to the presence of Goethite (a hydrated iron oxide) crystals.

Rusticles on the Titanic were the first investigated by Roy Cullimore , based at the University of Regina in Canada in 1996.