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Lead(II)iodide(PbI2).It is yellow colour when it is cold but it is brown colour when it is being heated.It contain lead and iodine.The compound currently has a few specialized applications, such as the manufacture solar cell and X-ray and gamma ray detectors.

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Anhydrous Cobalt(II)Chloride contain cobalt and chlorine, with the formula of CoCl₂. It is sky blue in colour. When Anhydrous Cobalt(II)Chloride come in contact with water it will turn to purple colour. Due to the colour change Anhydrous Cobalt(II)Chloride is used as an indicator for the presence of water.

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Sodium chromate (Na ₂ CrO ₄). It is yellow in colour. It is used as a corrosion inhibitor in the petroleum industry. It is also a dyeing auxiliary in the textile industry and a wood preservative.
It is a diagnostic pharmaceutical in determining red blood cell volume.

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Sapphire is made from aluminium oxide, Al2O3.

The intense blue of the sapphire is caused by the addition of titanium (iii) ions and iron (iii) ions to the mineral corundum  (crystalline form of aluminium oxide).

Sapphire is commonly used in jewelry but is also used in infrared components, high-durability windows and wristwatch crystals due to its’ remarkable hardness.

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Saltpeter is a white ionic compound, which commonly use in manufacturing of fertilizers and gunpowder. It is also known as potassium nitrate (KNO ₃) , an alkali metal nitrate

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Strontium Nitrate(Sr(NO₃)₂
Is a type of  pyrotechnic colorant which causes a flame to burn with a particular color,specifically red. It is used in fire works and road flares, burning with a red light. This is due to the presence of strontium(II) ion considering the color of the flame is dependent on the cation,with the anion of the salt having little effect.The anion however does affect the temperature of the flame

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Potassium dichromate (K2Cr2O7) is a crystalline ionic solid with a very bright, red-orange color. It is used as an ingredient in cement in which it retards the setting of the mixture and improves its density and texture.

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Chalcanthite is common in arid regions due to its ready solubility and is used as jewellery. It is also known as copper(II)sulphate pentahydrate. It is blue in colour because of the presence of copper(II)ions.

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Rubyis a gemstone commonly found in jewelry. It is mainly made from corundum(Aluminium oxide). It's red coloring is  caused by the chromium(iii) impurities

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Hematite (Iron(III) oxide) is a gemstone which Chinese used it for ''Feng Shui''. The colour of hematite is black because Limonite (hydrated iron(III) oxide) loss water .

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Emerald is a precious stone used in jewellery. The distinct colour is caused by chromium(III) ions replacing aluminium in some location in the structure.

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Amethyst is a precious stone used as jewellery.  It is sand (Silicon dioxide). Its purple coloring is caused by
manganese (VII) compounds.