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6. Rubber industry: Latex obtained from rubber trees is an emulsion consisting of a dispersion of negatively charged rubber particles in water. In order to obtain rubber from latex, the latter is boiled when rubber particles get coagulated. The coagulated mass is vulcanized and sold as natural rubber. Rubber-plated articles can be prepared directly from latex by electrically depositing the negatively charged rubber particles over the article to be rubber-plated by making the article an anode in the rubber-plating bath. 7. Leather tanning: During the tanning of leather, the positively charged colloidal particles of raw skin and hides are coagulated by the negatively charged tanning materials which include tannin and compounds of aluminium and chromium. On soaking hides in the solutions of tanning materials, the coagulation of negatively charged tanning materials takes place in the pores of hides and the latter get hardened. 8. Cleansing action of soaps: Soaps solution is colloidal in nature and removes dirt and oil from clothes by forming water soluble emulsion as explained earlier. 9. Smoke screen: In chemical warfare, smoke screens are generally used to hide the movement of troops. Smoke screens are the colloidal dispersions of very fine particles of titanium oxide in air. 10. Formation of delta: When a river falls into the sea, extensive deposits of sand and clay are formed at the mouth of the river in the sea. Such deposits are called delta. The river water contains colloidal particles of sand and clay which carry negative charge. The sea water contains a number of positive ions such as Na+, Mg2+, Ca2+ ion etc. When the river water comes in contact with sea water, the negative charge present on colloidal sand and clay particles get neutralized by the positively charged ions (present in sea water) and they get coagulated. The coagulated sand and clay particles settle down and take the shape of delta in due course of time. Formation of delta11. Blue colour of the sky: The sky is the empty space around earth and as such has no colour. It appears blue due to the scattering of light by the colloidal dust particles present in air (Tyndall effect). 12. Preparation of Nano-materials: Nano-materials which are used as catalyst are prepared by using reverse micelles. 13. Building roads: Now a day, roads are built asphalt emulsified in water. This technique does not require the necessity of melting the asphalt. 14. Metallurgical operations: Several metal ores are concentrated by froth floatation process. This process involves the treatment of the pulverized ore in emulsion of pine oil.
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