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Glossary
M

Marble

Stone flooring material composed of a type of limestone hard enough to be polished that has visible veins within the stone.

Micro-organism

Organism to small to be visible to the eye.

Metal cleaner and polish

metal presents a special cleaning problem, tarnish (the oxidation of metal), which is the principal soil to be removed. Metal cleaning products are sold as pastes, thick opaque liquids or clear liquids which may hold a fine abrasive in suspension. Surface impurities on most metals are removed more easily in an acidic medium. Metal cleaning products, therefore, usually contain organic acids, such as oxalic, sulphuric or citric. To aid in mechanical removal of tarnish and soil and contribute to metallic lustre, a very mild abrasive is present as a polishing/buffering agent. Clay-like materials, such as kaopolite or finely divided hydrous silica, are common mild abrasives used. Metal cleaning formulations may also contain surfactants for ease of spreading the product as well as an aid in soil removal. Some products also contain an antioxidant, to protect against retarnishing.