From MarineSpecies Traits Wiki
A marine paint composition containing poisonous ingredients which prevent or retard fouling or marine underwater growth on ships' bottoms etc. Mercuric oxides are the chemicals generally blended to act as repellents to the undesirable growth. Paint manufacturers are continuously studying the possibility of introducing improved and sophisticated antifouling material and the formulas used are mostly kept secret by the blenders or manufacturers. 
- Sullivan P (ed.), 1999. Eric Sullivan's encyclopaedic dictionary. 6th edition. LPP Reference Publishing.
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