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Agastya  was a Vedic scholar. These were Vaishhish Muni's older brother. His birth was Shravan Shukla Panchami (accordingly 3000 BC) in Kashi. At present, the place is famous as Agasthyukund. His wife Lopamudra Vidarbha was the princess of the country. They are considered to be one of the seventies. On the request of the gods, he left Kashi and traveled to the south and later settled there. Maharishi Agastya was also a Vedic sage in the order of scientific sages. Surely the modern age was invented by
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Dye penetrant inspection (DPI), also called liquid penetrate inspection (LPI) or penetrant testing (PT), is a widely applied and low-cost inspection method used to locate surface-breaking defects in all non-porous materials (metals, plastics, or ceramics). The penetrant may be applied to all non-ferrous materials and ferrous materials, although for ferrous components magnetic-particle inspection is often used instead for its subsurface detection capability.

An alloy is a mixture of chemical elements, which forms an impure substance (admixture) that retains the characteristics of a metal. An alloy is distinct from an impure metal in that, with an alloy, the added elements are well controlled to produce desirable properties, while impure metals such as wrought iron are less controlled, but are often considered useful. Alloys are made by mixing two or more elements, at least one of which is a metal. This is usually called the primary metal or the base metal, and the name of this metal may also be the name of the alloy.